From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Thu, 20 Sep 2018 17:48:49 -0700
Subject: mas: avoid usage of NSAccessibilityRemoteUIElement

According to ccameron:

NSAccessibilityRemoteUIElement is unnecessary for Electron's use-case. We use it
for progressive web apps (where the AXTree is in the browser process, but macOS
needs to think it's coming from the PWA process). I think it can just be chopped
out -- if there are any side-effects, we should be able to work around them.

diff --git a/components/remote_cocoa/app_shim/application_bridge.mm b/components/remote_cocoa/app_shim/application_bridge.mm
index 89b9323c08cfed0d3ea3a0ec1beaa0bdfabe343e..d000b7f43f393d297a3715ea4279537bcf3fa813 100644
--- a/components/remote_cocoa/app_shim/application_bridge.mm
+++ b/components/remote_cocoa/app_shim/application_bridge.mm
@@ -51,6 +51,7 @@
 
   // NativeWidgetNSWindowHostHelper:
   id GetNativeViewAccessible() override {
+#ifndef MAS_BUILD
     if (!remote_accessibility_element_) {
       base::ProcessId browser_pid = base::kNullProcessId;
       std::vector<uint8_t> element_token;
@@ -61,6 +62,9 @@ id GetNativeViewAccessible() override {
           ui::RemoteAccessibility::GetRemoteElementFromToken(element_token);
     }
     return remote_accessibility_element_.get();
+#else
+    return nil;
+#endif
   }
   void DispatchKeyEvent(ui::KeyEvent* event) override {
     bool event_handled = false;
@@ -99,8 +103,10 @@ void GetWordAt(const gfx::Point& location_in_content,
   mojo::AssociatedRemote<mojom::TextInputHost> text_input_host_remote_;
 
   std::unique_ptr<NativeWidgetNSWindowBridge> bridge_;
+#ifndef MAS_BUILD
   base::scoped_nsobject<NSAccessibilityRemoteUIElement>
       remote_accessibility_element_;
+#endif
 };
 
 }  // namespace
diff --git a/components/remote_cocoa/app_shim/native_widget_ns_window_bridge.mm b/components/remote_cocoa/app_shim/native_widget_ns_window_bridge.mm
index 1b91b71bae8201d7cae5850a8c810bd179a36ab1..7f4bc1ded505067ba83001b389ab5813bad17dc4 100644
--- a/components/remote_cocoa/app_shim/native_widget_ns_window_bridge.mm
+++ b/components/remote_cocoa/app_shim/native_widget_ns_window_bridge.mm
@@ -566,10 +566,12 @@ NSUInteger CountBridgedWindows(NSArray* child_windows) {
   // this should be treated as an error and caught early.
   CHECK(bridged_view_);
 
+#ifndef MAS_BUILD
   // Send the accessibility tokens for the NSView now that it exists.
   host_->SetRemoteAccessibilityTokens(
       ui::RemoteAccessibility::GetTokenForLocalElement(window_),
       ui::RemoteAccessibility::GetTokenForLocalElement(bridged_view_));
+#endif
 
   // Beware: This view was briefly removed (in favor of a bare CALayer) in
   // crrev/c/1236675. The ordering of unassociated layers relative to NSView
diff --git a/content/app_shim_remote_cocoa/ns_view_bridge_factory_impl.mm b/content/app_shim_remote_cocoa/ns_view_bridge_factory_impl.mm
index abd19b8613e52a6f4c9404f509ab7ed5a61046a6..35945493a02996e88b0c53caf107c4352450aff7 100644
--- a/content/app_shim_remote_cocoa/ns_view_bridge_factory_impl.mm
+++ b/content/app_shim_remote_cocoa/ns_view_bridge_factory_impl.mm
@@ -77,6 +77,7 @@ explicit RenderWidgetHostNSViewBridgeOwner(
 
   // RenderWidgetHostNSViewHostHelper implementation.
   id GetAccessibilityElement() override {
+#ifndef MAS_BUILD
     if (!remote_accessibility_element_) {
       base::ProcessId browser_pid = base::kNullProcessId;
       std::vector<uint8_t> element_token;
@@ -87,6 +88,9 @@ id GetAccessibilityElement() override {
           ui::RemoteAccessibility::GetRemoteElementFromToken(element_token);
     }
     return remote_accessibility_element_.get();
+#else
+    return nil;
+#endif
   }
 
   id GetRootBrowserAccessibilityElement() override {
@@ -100,8 +104,10 @@ id GetFocusedBrowserAccessibilityElement() override {
     return nil;
   }
   void SetAccessibilityWindow(NSWindow* window) override {
+#ifndef MAS_BUILD
     host_->SetRemoteAccessibilityWindowToken(
         ui::RemoteAccessibility::GetTokenForLocalElement(window));
+#endif
   }
 
   void ForwardKeyboardEvent(const content::NativeWebKeyboardEvent& key_event,
@@ -163,8 +169,10 @@ void SmartMagnify(const blink::WebGestureEvent& web_event) override {
 
   mojo::AssociatedRemote<mojom::RenderWidgetHostNSViewHost> host_;
   std::unique_ptr<RenderWidgetHostNSViewBridge> bridge_;
+#ifndef MAS_BUILD
   base::scoped_nsobject<NSAccessibilityRemoteUIElement>
       remote_accessibility_element_;
+#endif
 };
 }
 
diff --git a/content/browser/accessibility/browser_accessibility_manager_mac.mm b/content/browser/accessibility/browser_accessibility_manager_mac.mm
index 67473b500bc8305bc21ec0324001ea5a64612aee..964acff055c3e192813b7793894b3fde8940facb 100644
--- a/content/browser/accessibility/browser_accessibility_manager_mac.mm
+++ b/content/browser/accessibility/browser_accessibility_manager_mac.mm
@@ -22,7 +22,9 @@
 #include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
 #include "ui/accessibility/ax_role_properties.h"
 #include "ui/accessibility/platform/ax_private_webkit_constants_mac.h"
+#ifndef MAS_BUILD
 #include "ui/base/cocoa/remote_accessibility_api.h"
+#endif
 
 namespace {
 
@@ -621,6 +623,7 @@ void PostAnnouncementNotification(NSString* announcement) {
   if ([NSApp isActive])
     return window == [NSApp accessibilityFocusedWindow];
 
+#ifndef MAS_BUILD
   // TODO(accessibility): We need a solution to the problem described below.
   // If the window is NSAccessibilityRemoteUIElement, there are some challenges:
   // 1. NSApp is the browser which spawned the PWA, and what it considers the
@@ -648,6 +651,7 @@ void PostAnnouncementNotification(NSString* announcement) {
   // from within the app shim content.
   if ([window isKindOfClass:[NSAccessibilityRemoteUIElement class]])
     return true;
+#endif
 
   return false;
 }
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index c1f2725cf74fe8845843461518a849f2cbf2c024..897f46a7333eb80c8fe54535f6159dc1350d2d64 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -52,7 +52,9 @@ class ScopedPasswordInputEnabler;
 
 @protocol RenderWidgetHostViewMacDelegate;
 
+#ifndef MAS_BUILD
 @class NSAccessibilityRemoteUIElement;
+#endif
 @class RenderWidgetHostViewCocoa;
 
 namespace content {
@@ -671,10 +673,12 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   // EnsureSurfaceSynchronizedForWebTest().
   uint32_t latest_capture_sequence_number_ = 0u;
 
+#ifndef MAS_BUILD
   // Remote accessibility objects corresponding to the NSWindow that this is
   // displayed to the user in.
   base::scoped_nsobject<NSAccessibilityRemoteUIElement>
       remote_window_accessible_;
+#endif
 
   // Used to force the NSApplication's focused accessibility element to be the
   // content::BrowserAccessibilityCocoa accessibility tree when the NSView for
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index f2cd4583734aab9a6760f357eb6fb9ce73d96753..a420b3cf9b1c325967318db322d61c4ebc4cf7c6 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -260,8 +260,10 @@
 void RenderWidgetHostViewMac::MigrateNSViewBridge(
     remote_cocoa::mojom::Application* remote_cocoa_application,
     uint64_t parent_ns_view_id) {
+#ifndef MAS_BUILD
   // Destroy the previous remote accessibility element.
   remote_window_accessible_.reset();
+#endif
 
   // Disconnect from the previous bridge (this will have the effect of
   // destroying the associated bridge), and close the receiver (to allow it
@@ -1574,8 +1576,10 @@ void CombineTextNodesAndMakeCallback(SpeechCallback callback,
 
 gfx::NativeViewAccessible
 RenderWidgetHostViewMac::AccessibilityGetNativeViewAccessibleForWindow() {
+#ifndef MAS_BUILD
   if (remote_window_accessible_)
     return remote_window_accessible_.get();
+#endif
   return [GetInProcessNSView() window];
 }
 
@@ -1623,9 +1627,11 @@ void CombineTextNodesAndMakeCallback(SpeechCallback callback,
 }
 
 void RenderWidgetHostViewMac::SetAccessibilityWindow(NSWindow* window) {
+#ifndef MAS_BUILD
   // When running in-process, just use the NSView's NSWindow as its own
   // accessibility element.
   remote_window_accessible_.reset();
+#endif
 }
 
 bool RenderWidgetHostViewMac::SyncIsWidgetForMainFrame(
@@ -2121,20 +2127,26 @@ void CombineTextNodesAndMakeCallback(SpeechCallback callback,
 void RenderWidgetHostViewMac::GetRenderWidgetAccessibilityToken(
     GetRenderWidgetAccessibilityTokenCallback callback) {
   base::ProcessId pid = getpid();
+#ifndef MAS_BUILD
   id element_id = GetNativeViewAccessible();
   std::vector<uint8_t> token =
       ui::RemoteAccessibility::GetTokenForLocalElement(element_id);
+#else
+  std::vector<uint8_t> token;
+#endif
   std::move(callback).Run(pid, token);
 }
 
 void RenderWidgetHostViewMac::SetRemoteAccessibilityWindowToken(
     const std::vector<uint8_t>& window_token) {
+#ifndef MAS_BUILD
   if (window_token.empty()) {
     remote_window_accessible_.reset();
   } else {
     remote_window_accessible_ =
         ui::RemoteAccessibility::GetRemoteElementFromToken(window_token);
   }
+#endif
 }
 
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index 3d74c126c9a019f5a4b58235ef9f43ea235a76bf..2d026f3e34679137e4a68b3c57fc2e71dda1f17b 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -353,6 +353,13 @@ component("base") {
     sources += [ "resource/resource_bundle_lacros.cc" ]
   }
 
+  if (is_mas_build) {
+    sources -= [
+      "cocoa/remote_accessibility_api.h",
+      "cocoa/remote_accessibility_api.mm",
+    ]
+  }
+
   if (is_ios) {
     sources += [
       "device_form_factor_ios.mm",
diff --git a/ui/base/cocoa/remote_accessibility_api.h b/ui/base/cocoa/remote_accessibility_api.h
index 4d47115d3f72da17b2ada8866770ac24717c29da..a74c655a6143a3ce9b10c6c23a508b1d306bb980 100644
--- a/ui/base/cocoa/remote_accessibility_api.h
+++ b/ui/base/cocoa/remote_accessibility_api.h
@@ -11,6 +11,8 @@
 #include "base/component_export.h"
 #include "base/mac/scoped_nsobject.h"
 
+#ifndef MAS_BUILD
+
 @interface NSAccessibilityRemoteUIElement : NSObject
 + (void)setRemoteUIApp:(BOOL)flag;
 + (void)registerRemoteUIProcessIdentifier:(int)pid;
@@ -33,4 +35,6 @@ class COMPONENT_EXPORT(UI_BASE) RemoteAccessibility {
 
 }  // namespace ui
 
+#endif  // MAS_BUILD
+
 #endif  // UI_BASE_COCOA_REMOTE_ACCESSIBILITY_API_H_
diff --git a/ui/views/cocoa/native_widget_mac_ns_window_host.h b/ui/views/cocoa/native_widget_mac_ns_window_host.h
index f6d8e8847203d705aea9f581bab84c361a6164c9..d8b17d16aaeba9e9aa95bd0e646a143b325ecc64 100644
--- a/ui/views/cocoa/native_widget_mac_ns_window_host.h
+++ b/ui/views/cocoa/native_widget_mac_ns_window_host.h
@@ -32,7 +32,9 @@
 #include "ui/views/window/dialog_observer.h"
 
 @class NativeWidgetMacNSWindow;
+#ifndef MAS_BUILD
 @class NSAccessibilityRemoteUIElement;
+#endif
 @class NSView;
 
 namespace remote_cocoa {
@@ -463,11 +465,13 @@ class VIEWS_EXPORT NativeWidgetMacNSWindowHost
   mojo::AssociatedRemote<remote_cocoa::mojom::NativeWidgetNSWindow>
       remote_ns_window_remote_;
 
+#ifndef MAS_BUILD
   // Remote accessibility objects corresponding to the NSWindow and its root
   // NSView.
   base::scoped_nsobject<NSAccessibilityRemoteUIElement>
       remote_window_accessible_;
   base::scoped_nsobject<NSAccessibilityRemoteUIElement> remote_view_accessible_;
+#endif
 
   // Used to force the NSApplication's focused accessibility element to be the
   // views::Views accessibility tree when the NSView for this is focused.
diff --git a/ui/views/cocoa/native_widget_mac_ns_window_host.mm b/ui/views/cocoa/native_widget_mac_ns_window_host.mm
index bde63eb428a0271a992dff06fcc0bf97731623cd..ce87fa64378d71ef4982cfceda92b736bedd9255 100644
--- a/ui/views/cocoa/native_widget_mac_ns_window_host.mm
+++ b/ui/views/cocoa/native_widget_mac_ns_window_host.mm
@@ -335,14 +335,22 @@ void HandleAccelerator(const ui::Accelerator& accelerator,
 NativeWidgetMacNSWindowHost::GetNativeViewAccessibleForNSView() const {
   if (in_process_ns_window_bridge_)
     return in_process_ns_window_bridge_->ns_view();
+#ifndef MAS_BUILD
   return remote_view_accessible_.get();
+#else
+  return nullptr;
+#endif
 }
 
 gfx::NativeViewAccessible
 NativeWidgetMacNSWindowHost::GetNativeViewAccessibleForNSWindow() const {
   if (in_process_ns_window_bridge_)
     return in_process_ns_window_bridge_->ns_window();
+#ifndef MAS_BUILD
   return remote_window_accessible_.get();
+#else
+  return nullptr;
+#endif
 }
 
 remote_cocoa::mojom::NativeWidgetNSWindow*
@@ -1329,6 +1337,7 @@ void HandleAccelerator(const ui::Accelerator& accelerator,
 void NativeWidgetMacNSWindowHost::SetRemoteAccessibilityTokens(
     const std::vector<uint8_t>& window_token,
     const std::vector<uint8_t>& view_token) {
+#ifndef MAS_BUILD
   remote_window_accessible_ =
       ui::RemoteAccessibility::GetRemoteElementFromToken(window_token);
   remote_view_accessible_ =
@@ -1337,14 +1346,17 @@ void HandleAccelerator(const ui::Accelerator& accelerator,
   [remote_view_accessible_
       setTopLevelUIElement:remote_window_accessible_.get()];
   [NSAccessibilityRemoteUIElement setRemoteUIApp:YES];
+#endif
 }
 
 bool NativeWidgetMacNSWindowHost::GetRootViewAccessibilityToken(
     base::ProcessId* pid,
     std::vector<uint8_t>* token) {
+#ifndef MAS_BUILD
   *pid = getpid();
   id element_id = GetNativeViewAccessible();
   *token = ui::RemoteAccessibility::GetTokenForLocalElement(element_id);
+#endif
   return true;
 }
 
