electron/patches/chromium/allow_disabling_blink_scheduler_throttling_per_renderview.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: deepak1556 <[email protected]>
Date: Mon, 18 May 2020 11:12:26 -0700
Subject: allow disabling blink scheduler throttling per RenderView

This allows us to disable throttling for hidden windows.

diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 093bed2d057df4b12ae01b8edc11c7924233b0c5..43a24c45bc5adf1bb6a3eb00c3b3ad64e663522f 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -716,6 +716,11 @@ void RenderViewHostImpl::SetBackgroundOpaque(bool opaque) {
   GetWidget()->GetAssociatedFrameWidget()->SetBackgroundOpaque(opaque);
 }
 
+void RenderViewHostImpl::SetSchedulerThrottling(bool allowed) {
+  if (auto& broadcast = GetAssociatedPageBroadcast())
+    broadcast->SetSchedulerThrottling(allowed);
+}
+
 bool RenderViewHostImpl::IsMainFrameActive() {
   return is_active();
 }
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index 2d5431caee0b44828ae35a861cda8b15b587123f..5db98459e35767aee91c9b901c10f2f59ac1456b 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -139,6 +139,7 @@ class CONTENT_EXPORT RenderViewHostImpl
   void EnablePreferredSizeMode() override;
   void WriteIntoTrace(perfetto::TracedProto<TraceProto> context) const override;
 
+  void SetSchedulerThrottling(bool allowed) override;
   void SendWebPreferencesToRenderer();
   void SendRendererPreferencesToRenderer(
       const blink::RendererPreferences& preferences);
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 2b7a01cd1e7637031bbd28ba32f332f9f97456f1..9840d0e1308bc6e4589f32f6eac5e27f353895dd 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -564,8 +564,8 @@ void RenderWidgetHostViewAura::ShowImpl(PageVisibilityState page_visibility) {
   // OnShowWithPageVisibility will not call NotifyHostAndDelegateOnWasShown,
   // which updates `visibility_`, unless the host is hidden. Make sure no update
   // is needed.
-  DCHECK(host_->is_hidden() || visibility_ == Visibility::VISIBLE);
-  OnShowWithPageVisibility(page_visibility);
+  if (host_->is_hidden() || visibility_ == Visibility::VISIBLE)
+    OnShowWithPageVisibility(page_visibility);
 }
 
 void RenderWidgetHostViewAura::NotifyHostAndDelegateOnWasShown(
diff --git a/content/public/browser/render_view_host.h b/content/public/browser/render_view_host.h
index 9979c25ecd57e68331b628a518368635db5c2027..f65bfbbb663a5bb0511ffa389d3163e0fdeb4d1f 100644
--- a/content/public/browser/render_view_host.h
+++ b/content/public/browser/render_view_host.h
@@ -76,6 +76,9 @@ class CONTENT_EXPORT RenderViewHost {
   virtual void WriteIntoTrace(
       perfetto::TracedProto<TraceProto> context) const = 0;
 
+  // Disable/Enable scheduler throttling.
+  virtual void SetSchedulerThrottling(bool allowed) {}
+
  private:
   // This interface should only be implemented inside content.
   friend class RenderViewHostImpl;
diff --git a/content/test/test_page_broadcast.h b/content/test/test_page_broadcast.h
index b2204672b2dde14ce91a0c67e8a5b5ebede55aa9..0f9bed79ba572a5fffb4f39e2ffc6f58970ee7cb 100644
--- a/content/test/test_page_broadcast.h
+++ b/content/test/test_page_broadcast.h
@@ -47,6 +47,7 @@ class TestPageBroadcast : public blink::mojom::PageBroadcast {
                                           browsing_context_group_info) override;
   void SetPageAttributionSupport(
       network::mojom::AttributionSupport support) override;
+  void SetSchedulerThrottling(bool allowed) override {}
 
   mojo::AssociatedReceiver<blink::mojom::PageBroadcast> receiver_;
 };
diff --git a/third_party/blink/public/mojom/page/page.mojom b/third_party/blink/public/mojom/page/page.mojom
index 1270218d71d365b3b33188ba803026e9a24f51dc..78fe7a385eb8781787c5288a9eb790df05afa088 100644
--- a/third_party/blink/public/mojom/page/page.mojom
+++ b/third_party/blink/public/mojom/page/page.mojom
@@ -162,4 +162,7 @@ interface PageBroadcast {
   // supported/unsupported or when attribution is enabled/disabled for
   // Android WebView.
   SetPageAttributionSupport(network.mojom.AttributionSupport support);
+
+  // Whether to enable the Renderer scheduler background throttling.
+  SetSchedulerThrottling(bool allowed);
 };
diff --git a/third_party/blink/public/web/web_view.h b/third_party/blink/public/web/web_view.h
index e89d7153d66d15e6e9a2a6980aaec5c671dfd0f3..c77228f8aa6ada81bcafc2622d784bb3f85cca30 100644
--- a/third_party/blink/public/web/web_view.h
+++ b/third_party/blink/public/web/web_view.h
@@ -371,6 +371,7 @@ class BLINK_EXPORT WebView {
   // Scheduling -----------------------------------------------------------
 
   virtual PageScheduler* Scheduler() const = 0;
+  virtual void SetSchedulerThrottling(bool allowed) {}
 
   // Visibility -----------------------------------------------------------
 
diff --git a/third_party/blink/renderer/core/exported/web_view_impl.cc b/third_party/blink/renderer/core/exported/web_view_impl.cc
index 9f211819ae0b54718c89ecb777fbf469fa4ebe4d..d9b1a87fb6c7dca120c1a7d25eeda1135f4a3831 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.cc
+++ b/third_party/blink/renderer/core/exported/web_view_impl.cc
@@ -2395,6 +2395,10 @@ void WebViewImpl::SetPageLifecycleStateInternal(
   TRACE_EVENT2("navigation", "WebViewImpl::SetPageLifecycleStateInternal",
                "old_state", old_state, "new_state", new_state);
 
+  // If backgroundThrottling is disabled, the page is always visible.
+  if (!scheduler_throttling_allowed_)
+      new_state->visibility = mojom::blink::PageVisibilityState::kVisible;
+
   bool storing_in_bfcache = new_state->is_in_back_forward_cache &&
                             !old_state->is_in_back_forward_cache;
   bool restoring_from_bfcache = !new_state->is_in_back_forward_cache &&
@@ -3885,10 +3889,23 @@ PageScheduler* WebViewImpl::Scheduler() const {
   return GetPage()->GetPageScheduler();
 }
 
+void WebViewImpl::SetSchedulerThrottling(bool allowed) {
+  DCHECK(GetPage());
+  scheduler_throttling_allowed_ = allowed;
+  GetPage()->GetPageScheduler()->SetPageVisible(!allowed || GetVisibilityState() == mojom::blink::PageVisibilityState::kVisible);
+}
+
 void WebViewImpl::SetVisibilityState(
     mojom::blink::PageVisibilityState visibility_state,
     bool is_initial_state) {
   DCHECK(GetPage());
+
+  if (!scheduler_throttling_allowed_) {
+    GetPage()->SetVisibilityState(mojom::blink::PageVisibilityState::kVisible, is_initial_state);
+    GetPage()->GetPageScheduler()->SetPageVisible(true);
+    return;
+  }
+
   GetPage()->SetVisibilityState(visibility_state, is_initial_state);
   // Do not throttle if the page should be painting.
   bool is_visible =
diff --git a/third_party/blink/renderer/core/exported/web_view_impl.h b/third_party/blink/renderer/core/exported/web_view_impl.h
index 90359a1f1aafadc7bb4e8776c9b609a7485072f6..b66744a6557152b69a3c769f8dfb5b0221d67a01 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.h
+++ b/third_party/blink/renderer/core/exported/web_view_impl.h
@@ -447,6 +447,7 @@ class CORE_EXPORT WebViewImpl final : public WebView,
   LocalDOMWindow* PagePopupWindow() const;
 
   PageScheduler* Scheduler() const override;
+  void SetSchedulerThrottling(bool allowed) override;
   void SetVisibilityState(mojom::blink::PageVisibilityState visibility_state,
                           bool is_initial_state) override;
   mojom::blink::PageVisibilityState GetVisibilityState() override;
@@ -914,6 +915,8 @@ class CORE_EXPORT WebViewImpl final : public WebView,
   // If true, we send IPC messages when |preferred_size_| changes.
   bool send_preferred_size_changes_ = false;
 
+  bool scheduler_throttling_allowed_ = true;
+
   // Whether the preferred size may have changed and |UpdatePreferredSize| needs
   // to be called.
   bool needs_preferred_size_update_ = true;