Notify Blink to suppress frame requests during BeginMainFrame

third_party/WebKit/Source/core/page/PageAnimator.h

Index: third_party/WebKit/Source/core/page/PageAnimator.h
diff --git a/third_party/WebKit/Source/core/page/PageAnimator.h b/third_party/WebKit/Source/core/page/PageAnimator.h
index c2e62ae89d9e3920d98c99caeb788406585ae430..96843efe81734e149a9f4a285943e10887beb300 100644
--- a/third_party/WebKit/Source/core/page/PageAnimator.h
+++ b/third_party/WebKit/Source/core/page/PageAnimator.h
@@ -23,6 +23,12 @@ class CORE_EXPORT PageAnimator final : public GarbageCollected<PageAnimator> {
 
   bool isServicingAnimations() const { return m_servicingAnimations; }
 
+  // TODO(alancutter): Remove the need for this by implementing frame request
+  // suppression logic at the BeginMainFrame level. This is a temporary
+  // workaround to fix a perf regression.
+  // DO NOT use this outside of crbug.com/704763.
+  void setSuppressFrameRequestsWorkaroundFor704763Only(bool);
+
   // See documents of methods with the same names in FrameView class.
   void updateAllLifecyclePhases(LocalFrame& rootFrame);
   AnimationClock& clock() { return m_animationClock; }
@@ -33,6 +39,7 @@ class CORE_EXPORT PageAnimator final : public GarbageCollected<PageAnimator> {
   Member<Page> m_page;
   bool m_servicingAnimations;
   bool m_updatingLayoutAndStyleForPainting;
+  bool m_suppressFrameRequestsWorkaroundFor704763Only = false;
   AnimationClock m_animationClock;
 };