Calculate animation_floor_time_ only when actually updating animations

chrome/renderer/render_widget.h

 // Copyright (c) 2009 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 CHROME_RENDERER_RENDER_WIDGET_H_
 #define CHROME_RENDERER_RENDER_WIDGET_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 143 matching lines @@
   // shared memory segment returned by AllocPaintBuf on Windows). The caller
   // must ensure that the given rect fits within the bounds of the WebWidget.
   void PaintRect(const gfx::Rect& rect, const gfx::Point& canvas_origin,
                  skia::PlatformCanvas* canvas);
 
   // Paints a border at the given rect for debugging purposes.
   void PaintDebugBorder(const gfx::Rect& rect, skia::PlatformCanvas* canvas);
 
   void CallDoDeferredUpdate();
   void UpdateAnimationsIfNeeded();
+  void UpdateAnimationsAndFloorTime();
   void DoDeferredUpdate();
   void DoDeferredClose();
   void DoDeferredSetWindowRect(const WebKit::WebRect& pos);
 
   // Set the background of the render widget to a bitmap. The bitmap will be
   // tiled in both directions if it isn't big enough to fill the area. This is
   // mainly intended to be used in conjuction with WebView::SetIsTransparent().
   virtual void SetBackground(const SkBitmap& bitmap);
 
   // RenderWidget IPC message handlers
@@ skipping 191 matching lines @@
 
   // Indicates if the next sequence of Char events should be suppressed or not.
   bool suppress_next_char_events_;
 
   // Set to true if painting to the window is handled by the accelerated
   // compositor.
   bool is_accelerated_compositing_active_;
 
   base::Time animation_floor_time_;
   bool animation_update_pending_;
+  bool animation_waiting_for_paint_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CHROME_RENDERER_RENDER_WIDGET_H_