Suppress frame requests in InputMethodController::textInputType()

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PageAnimator_h
 #define PageAnimator_h
 
 #include "core/CoreExport.h"
 #include "core/animation/AnimationClock.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalFrame;
 class Page;
 
 class CORE_EXPORT PageAnimator final : public GarbageCollected<PageAnimator> {
  public:
   static PageAnimator* create(Page&);
   DECLARE_TRACE();
   void scheduleVisualUpdate(LocalFrame*);
   void serviceScriptedAnimations(double monotonicAnimationStartTime);
 
   bool isServicingAnimations() const { return m_servicingAnimations; }
 
   // See documents of methods with the same names in FrameView class.
   void updateAllLifecyclePhases(LocalFrame& rootFrame);
   AnimationClock& clock() { return m_animationClock; }
 
+  // TODO(alancutter): Remove the need for this by moving frame request
+  // supression logic up to BeginMainFrame, outside of Blink entirely. This is
+  // exposed as a temporary workaround for a perf regression (crbug.com/704763),
+  // do not use this class outside of PageAnimator.cpp.
+  class FrameRequestSuppressionScope {
+   public:
+    STACK_ALLOCATED();
+    FrameRequestSuppressionScope(PageAnimator*);
+    ~FrameRequestSuppressionScope();
+
+   private:
+    Member<PageAnimator> m_pageAnimator;
+  };
+
  private:
   explicit PageAnimator(Page&);
 
   Member<Page> m_page;
-  bool m_servicingAnimations;
-  bool m_updatingLayoutAndStyleForPainting;
+  bool m_servicingAnimations = false;
+  size_t m_frameRequestSuppressionDepth = 0;
   AnimationClock m_animationClock;
+
+  friend class FrameRequestSuppressionScope;
 };
 
 }  // namespace blink
 
 #endif  // PageAnimator_h