Implements getImageAnimationPolicy() at ImageLoader.

Source/platform/graphics/BitmapImage.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 581 matching lines @@
 bool BitmapImage::maybeAnimated()
 {
     if (m_animationFinished)
         return false;
     if (frameCount() > 1)
         return true;
 
     return m_source.repetitionCount() != cAnimationNone;
 }
 
+void BitmapImage::advanceTime(double deltaTimeInSeconds)
+{
+    if (m_desiredFrameStartTime)
+        m_desiredFrameStartTime -= deltaTimeInSeconds;
+    else
+        m_desiredFrameStartTime = monotonicallyIncreasingTime() - deltaTimeInSeconds;
+}
+
 void BitmapImage::advanceAnimation(Timer<BitmapImage>*)
 {
     internalAdvanceAnimation(false);
     // At this point the image region has been marked dirty, and if it's
     // onscreen, we'll soon make a call to draw(), which will call
     // startAnimation() again to keep the animation moving.
 }
 
 bool BitmapImage::internalAdvanceAnimation(bool skippingFrames)
 {
@@ skipping 61 matching lines @@
 
     return m_isSolidColor && !m_currentFrame;
 }
 
 Color BitmapImage::solidColor() const
 {
     return m_solidColor;
 }
 
 } // namespace blink