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 5cf4fd6559dd7183ed74e44001d7e53ca9b055b1..ca6a293882fe2af1e2bf58b8353e1c5c9de827d1 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -646,6 +646,11 @@ 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 c2d024d09dda8b221cc588e784cb2d31c273d0ff..c0fd9c5400acf32c89a477797c4d9c45662fb14c 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -136,6 +136,7 @@ class CONTENT_EXPORT RenderViewHostImpl
   bool IsRenderViewLive() override;
   void WriteIntoTrace(perfetto::TracedValue context) override;
 
+  void SetSchedulerThrottling(bool allowed) override;
   void SendWebPreferencesToRenderer();
   void SendRendererPreferencesToRenderer(
       const blink::RendererPreferences& preferences);
diff --git a/content/public/browser/render_view_host.h b/content/public/browser/render_view_host.h
index 787077d71c04d571aa825bec0a549c5fad2b8574..4b05b80802ba97a46eed60e509b503fc8375016b 100644
--- a/content/public/browser/render_view_host.h
+++ b/content/public/browser/render_view_host.h
@@ -74,6 +74,9 @@ class CONTENT_EXPORT RenderViewHost {
   // Write a representation of this object into a trace.
   virtual void WriteIntoTrace(perfetto::TracedValue context) = 0;
 
+  // Disable/Enable scheduler throttling.
+  virtual void SetSchedulerThrottling(bool allowed) = 0;
+
  private:
   // This interface should only be implemented inside content.
   friend class RenderViewHostImpl;
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 4e8d36420d6edc1725a840e1b9f123041d21abe4..dd198cb7bf02e509833c6b4c7d8e5d65d20d46dc 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -152,6 +152,8 @@ class CONTENT_EXPORT RenderViewImpl : public blink::WebViewClient,
   static WindowOpenDisposition NavigationPolicyToDisposition(
       blink::WebNavigationPolicy policy);
 
+  void OnSetSchedulerThrottling(bool allowed);
+
   // ---------------------------------------------------------------------------
   // ADDING NEW FUNCTIONS? Please keep private functions alphabetized and put
   // it in the same order in the .cc file as it was in the header.
diff --git a/third_party/blink/public/mojom/page/page.mojom b/third_party/blink/public/mojom/page/page.mojom
index b7c6ba65551acd31c96be06c3d7595f28b6855b0..21ce5fe263f8a47281b21c45c7bda9eff1cb17b5 100644
--- a/third_party/blink/public/mojom/page/page.mojom
+++ b/third_party/blink/public/mojom/page/page.mojom
@@ -97,4 +97,7 @@ interface PageBroadcast {
 
   // Sent to whole page, but should only be used by the main frame.
   SetPageBaseBackgroundColor(skia.mojom.SkColor? color);
+
+  // 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 14d4a00293ab0b11e733676844ce483992d6cd8e..c6c2dbb9dddd1eaa21e8c7b276d871a3898463fa 100644
--- a/third_party/blink/public/web/web_view.h
+++ b/third_party/blink/public/web/web_view.h
@@ -368,6 +368,7 @@ class WebView {
   // Scheduling -----------------------------------------------------------
 
   virtual PageScheduler* Scheduler() const = 0;
+  virtual void SetSchedulerThrottling(bool allowed) = 0;
 
   // 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 297ed65293723e8d539c65475d335947c840fec2..304dcdaa65ee1d9bed86f7c0e5956dd3a2a65585 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.cc
+++ b/third_party/blink/renderer/core/exported/web_view_impl.cc
@@ -3679,6 +3679,13 @@ 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) {
@@ -3690,7 +3697,8 @@ void WebViewImpl::SetVisibilityState(
   }
   GetPage()->SetVisibilityState(visibility_state, is_initial_state);
   GetPage()->GetPageScheduler()->SetPageVisible(
-      visibility_state == mojom::blink::PageVisibilityState::kVisible);
+      scheduler_throttling_allowed_ ?
+          (visibility_state == mojom::blink::PageVisibilityState::kVisible) : true);
 }
 
 mojom::blink::PageVisibilityState WebViewImpl::GetVisibilityState() {
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 25f9a9fc617d75dfd26af582574ebcad3a16a8ef..7d8473a7915fd3312c3a4f582b3f1d87580e6e75 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.h
+++ b/third_party/blink/renderer/core/exported/web_view_impl.h
@@ -419,6 +419,7 @@ 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;
@@ -855,6 +856,8 @@ 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;