electron/patches/chromium/allow_disabling_blink_scheduler_throttling_per_renderview.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: deepak1556 <hop2deep@gmail.com>
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 5175f4199154bd53c6a73e279cad4e0284b4a0c0..c05b00e9fd01334575535c9768db1976e28ccdc2 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -715,6 +715,11 @@ 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 eb478c177e5bd490778447c1bab81a33ca3972f0..374a1cb2ee2f35cca91da890a3edb2e06e13721d 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 73c0f64aa84061381a98ba60906835258f881468..41bdf7e231eca4617dbe53737a3925039bf77c4f 100644
--- a/content/test/test_page_broadcast.h
+++ b/content/test/test_page_broadcast.h
@@ -45,6 +45,7 @@ class TestPageBroadcast : public blink::mojom::PageBroadcast {
       override;
   void UpdatePageBrowsingContextGroup(const blink::BrowsingContextGroupInfo&
                                           browsing_context_group_info) 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 d3877e946b1d65eba5bb45efe786fbcc7925ca6e..73bd5056baf7e4278b7260e550e2b8516be72f20 100644
--- a/third_party/blink/public/mojom/page/page.mojom
+++ b/third_party/blink/public/mojom/page/page.mojom
@@ -155,4 +155,7 @@ interface PageBroadcast {
   // in `browsing_context_group_info`.
   UpdatePageBrowsingContextGroup(
     blink.mojom.BrowsingContextGroupInfo browsing_context_group_info);
+
+  // 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 8a18ecf567cd3a6a2fb1627083a5544a93198bf4..6bb4074e033e045de164bc776f75f152ea7be16f 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 ed24fcdfc8cfe1e6c04482c890655f11ff261f6c..68ef0766a4fe8254f5e632b218b4e879c7b4d1c6 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.cc
+++ b/third_party/blink/renderer/core/exported/web_view_impl.cc
@@ -2413,6 +2413,10 @@ 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 &&
@@ -3894,20 +3898,34 @@ 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) : true);
+}
+
 void WebViewImpl::SetVisibilityState(
     mojom::blink::PageVisibilityState visibility_state,
     bool is_initial_state) {
   DCHECK(GetPage());
-  GetPage()->SetVisibilityState(visibility_state, is_initial_state);
-  // Do not throttle if the page should be painting.
-  GetPage()->GetPageScheduler()->SetPageVisible(
-      visibility_state == mojom::blink::PageVisibilityState::kVisible ||
-      visibility_state ==
-          mojom::blink::PageVisibilityState::kHiddenButPainting);
-  // Notify observers of the change.
-  if (!is_initial_state) {
-    for (auto& observer : observers_)
-      observer.OnPageVisibilityChanged(visibility_state);
+
+  // If backgroundThrottling is disabled, the page is always visible.
+  if (!scheduler_throttling_allowed_) {
+    GetPage()->SetVisibilityState(mojom::blink::PageVisibilityState::kVisible, is_initial_state);
+    GetPage()->GetPageScheduler()->SetPageVisible(true);
+  } else {
+    bool is_visible =
+        (visibility_state == mojom::blink::PageVisibilityState::kVisible ||
+         visibility_state ==
+            mojom::blink::PageVisibilityState::kHiddenButPainting);
+    GetPage()->SetVisibilityState(visibility_state, is_initial_state);
+    GetPage()->GetPageScheduler()->SetPageVisible(is_visible);
+    // Notify observers of the change.
+    if (!is_initial_state) {
+      for (auto& observer : observers_)
+        observer.OnPageVisibilityChanged(visibility_state);
+    }
   }
 }
 
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 76456104656f863d7e5fb816a3e026c00ca8861d..24ba8dbbfc360ab12f28c2452c72c9f78307968c 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.h
+++ b/third_party/blink/renderer/core/exported/web_view_impl.h
@@ -445,6 +445,7 @@ 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;
@@ -912,6 +913,8 @@ 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;