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: disable remote layer APIs (CAContext and CALayerHost) for MAS
 build

Accordin to ccameron:

For apps that spend a lot of time watching video (especially fullscreen video),
the power/battery usage will likely increase 1.5x to 2x. For something that is,
e.g, scrolling, it'll be smaller, more like 1.15x or 1.25x.

In terms of performance, the impact will likely be fairly small -- any app that
could hit 60fps before will likely still be able to hit 60fps. There may even be
cases where performance improves when disabling remote CoreAnimation (remote
CoreAnimation is really only about battery usage).

diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.h b/gpu/ipc/service/image_transport_surface_overlay_mac.h
index 8d1b4e5bf4f95dc890a956b616860f955da5b929..9914fba92b472fbe52c1f14e695b213122350842 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.h
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.h
@@ -21,7 +21,9 @@
 #include "ui/gl/gl_surface_egl.h"
 #endif
 
+#ifndef MAS_BUILD
 @class CAContext;
+#endif
 @class CALayer;
 
 namespace ui {
@@ -117,7 +119,9 @@ class ImageTransportSurfaceOverlayMac : public gl::GLSurface,
   base::WeakPtr<ImageTransportSurfaceDelegate> delegate_;
 
   bool use_remote_layer_api_;
+#ifndef MAS_BUILD
   base::scoped_nsobject<CAContext> ca_context_;
+#endif
   std::unique_ptr<ui::CALayerTreeCoordinator> ca_layer_tree_coordinator_;
 
   gfx::Size pixel_size_;
@@ -212,7 +216,9 @@ class ImageTransportSurfaceOverlayMacEGL : public gl::GLSurfaceEGL,
   base::WeakPtr<ImageTransportSurfaceDelegate> delegate_;
 
   bool use_remote_layer_api_;
+#ifndef MAS_BUILD
   base::scoped_nsobject<CAContext> ca_context_;
+#endif
   std::unique_ptr<ui::CALayerTreeCoordinator> ca_layer_tree_coordinator_;
 
   gfx::Size pixel_size_;
diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.mm b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
index 622ae164022f2e78f0591f81e6afdb6e7331cdd3..3c3e351c4d8da67a5b78bc359bb3b9ed0c898011 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.mm
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
@@ -68,6 +68,7 @@
   ca_layer_tree_coordinator_ = std::make_unique<ui::CALayerTreeCoordinator>(
       use_remote_layer_api_, allow_av_sample_buffer_display_layer);
 
+#ifndef MAS_BUILD
   // Create the CAContext to send this to the GPU process, and the layer for
   // the context.
   if (use_remote_layer_api_) {
@@ -76,6 +77,7 @@
                                                    options:@{}] retain]);
     [ca_context_ setLayer:ca_layer_tree_coordinator_->GetCALayerForDisplay()];
   }
+#endif
 }
 
 ImageTransportSurfaceOverlayMac::~ImageTransportSurfaceOverlayMac() {
@@ -153,7 +155,9 @@
                          "GLImpl", static_cast<int>(gl::GetGLImplementation()),
                          "width", pixel_size_.width());
     if (use_remote_layer_api_) {
+#ifndef MAS_BUILD
       params.ca_context_id = [ca_context_ contextId];
+#endif
     } else {
       IOSurfaceRef io_surface =
           ca_layer_tree_coordinator_->GetIOSurfaceForDisplay();
@@ -385,6 +389,7 @@
   ca_layer_tree_coordinator_ = std::make_unique<ui::CALayerTreeCoordinator>(
       use_remote_layer_api_, allow_av_sample_buffer_display_layer);
 
+#ifndef MAS_BUILD
   // Create the CAContext to send this to the GPU process, and the layer for
   // the context.
   if (use_remote_layer_api_) {
@@ -393,6 +398,7 @@
                                                    options:@{}] retain]);
     [ca_context_ setLayer:ca_layer_tree_coordinator_->GetCALayerForDisplay()];
   }
+#endif
 }
 
 ImageTransportSurfaceOverlayMacEGL::~ImageTransportSurfaceOverlayMacEGL() {
@@ -490,7 +496,9 @@
                          "GLImpl", static_cast<int>(gl::GetGLImplementation()),
                          "width", pixel_size_.width());
     if (use_remote_layer_api_) {
+#ifndef MAS_BUILD
       params.ca_context_id = [ca_context_ contextId];
+#endif
     } else {
       IOSurfaceRef io_surface =
           ca_layer_tree_coordinator_->GetIOSurfaceForDisplay();
diff --git a/ui/accelerated_widget_mac/display_ca_layer_tree.mm b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
index 2c4821b34f71d30ce814bd1f3cf9a7a76bbaac66..cd7e0eac449bc81d5c9f6f0bed40b0d339712427 100644
--- a/ui/accelerated_widget_mac/display_ca_layer_tree.mm
+++ b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
@@ -99,6 +99,7 @@ - (void)setContentsChanged;
 }
 
 void DisplayCALayerTree::GotCALayerFrame(uint32_t ca_context_id) {
+#ifndef MAS_BUILD
   // Early-out if the remote layer has not changed.
   if ([remote_layer_ contextId] == ca_context_id)
     return;
@@ -123,6 +124,9 @@ - (void)setContentsChanged;
     [io_surface_layer_ removeFromSuperlayer];
     io_surface_layer_.reset();
   }
+#else
+  NOTREACHED() << "Remote layer is being used in MAS build";
+#endif
 }
 
 void DisplayCALayerTree::GotIOSurfaceFrame(
diff --git a/ui/base/cocoa/remote_layer_api.h b/ui/base/cocoa/remote_layer_api.h
index 9b691e2f16c68235dd180a28b6eb2eefc91f8e4c..0ce8048c6a72fe1483d71b2fd5786c28d86ac2bf 100644
--- a/ui/base/cocoa/remote_layer_api.h
+++ b/ui/base/cocoa/remote_layer_api.h
@@ -13,6 +13,7 @@
 
 #include "base/component_export.h"
 
+#ifndef MAS_BUILD
 // The CGSConnectionID is used to create the CAContext in the process that is
 // going to share the CALayers that it is rendering to another process to
 // display.
@@ -50,6 +51,8 @@ typedef uint32_t CAContextID;
 
 #endif // __OBJC__
 
+#endif // MAS_BUILD
+
 namespace ui {
 
 // This function will check if all of the interfaces listed above are supported
diff --git a/ui/base/cocoa/remote_layer_api.mm b/ui/base/cocoa/remote_layer_api.mm
index e23eb7719a9798afe984c6af6a422167b93d89b5..2fcc48067c2992a2fae950a678269014b7295817 100644
--- a/ui/base/cocoa/remote_layer_api.mm
+++ b/ui/base/cocoa/remote_layer_api.mm
@@ -10,6 +10,7 @@
 
 namespace ui {
 
+#ifndef MAS_BUILD
 namespace {
 // Control use of cross-process CALayers to display content directly from the
 // GPU process on Mac.
@@ -17,8 +18,10 @@
              "RemoteCoreAnimationAPI",
              base::FEATURE_ENABLED_BY_DEFAULT);
 }  // namespace
+#endif
 
 bool RemoteLayerAPISupported() {
+#ifndef MAS_BUILD
   if (!base::FeatureList::IsEnabled(kRemoteCoreAnimationAPI))
     return false;
 
@@ -50,6 +53,9 @@ bool RemoteLayerAPISupported() {
 
   // If everything is there, we should be able to use the API.
   return true;
+#else
+  return false;
+#endif  // MAS_BUILD
 }
 
 }  // namespace
