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 af75828e89e8cb1cca20c8acd64c9f864c0ffab7..182a6ebdf1ccad6b6ef7a2d45791bc0f5dc456f2 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -627,6 +627,11 @@ 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 b51bd8160bf63a75066d23514b727eb365a3918c..48413119621f6b118b80d681f777e74af8dc8ab7 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -135,6 +135,7 @@ 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 8bb06dec16fbf205230a10e0e52daa787338bc23..9ebc42788391e838e78af75e2449dde4f1107f22 100644
--- a/content/public/browser/render_view_host.h
+++ b/content/public/browser/render_view_host.h
@@ -84,6 +84,9 @@ 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 604edaea033172123d1e7d9c5512bebf55738db5..93b06e71dae1b9c01463c8b26b74516bad7d5b6d 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -150,6 +150,8 @@ 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 df834821bd082b92a9b4bd0858d900f554469afe..1e3b281eab8de5d3ab46a01d520737ecc477c3ff 100644
--- a/third_party/blink/public/mojom/page/page.mojom
+++ b/third_party/blink/public/mojom/page/page.mojom
@@ -91,4 +91,7 @@ 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 f54b993e9fb9fedcedef327290c2e5d706c699a7..73874e124e2810f07b72fc094f57c85c0fcf1dbb 100644
--- a/third_party/blink/public/web/web_view.h
+++ b/third_party/blink/public/web/web_view.h
@@ -366,6 +366,7 @@ 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 7995eb16a7cf6a824653736ca067baa5e688834f..c26e087f2f4d7a1446ce439e5a08a34aa2ccfec4 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.cc
+++ b/third_party/blink/renderer/core/exported/web_view_impl.cc
@@ -3630,6 +3630,13 @@ 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) {
@@ -3641,7 +3648,8 @@ 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 293e146acb0257a80d41eecf0794b7f08aa0ffc4..c1c88c9349d3882f3896fa1ed715433d9cf19429 100644
--- a/third_party/blink/renderer/core/exported/web_view_impl.h
+++ b/third_party/blink/renderer/core/exported/web_view_impl.h
@@ -417,6 +417,7 @@ 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;
@@ -848,6 +849,8 @@ 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;