Animated WebP: Optimize decoding in case of seeking

Source/core/platform/graphics/chromium/ImageDecodingStoreTest.cpp

 /*
  * Copyright (C) 2012 Google 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 45 matching lines @@
     {
         ++m_decodersDestroyed;
     }
 
     virtual void frameBufferRequested()
     {
         // Decoder is never used by ImageDecodingStore.
         ASSERT_TRUE(false);
     }
 
-    virtual ImageFrame::FrameStatus frameStatus()
+    virtual ImageFrame::Status frameStatus()

[Peter Kasting, 2013/08/23 01:14:02]

Nit: Name this status() (same everywhere else in this patch)

[urvang (Google), 2013/08/23 02:34:31]

Done.

     {
         return ImageFrame::FramePartial;
     }
 
     virtual size_t frameCount() { return 1; }
     virtual int repetitionCount() const { return cAnimationNone; }
     virtual float frameDuration() const { return 0; }
 
 protected:
     PassOwnPtr<ScaledImageFragment> createCompleteImage(const SkISize& size, bool discardable = false, size_t index = 0)
@@ skipping 374 matching lines @@
     const ScaledImageFragment* cachedImage = lockCache(SkISize::Make(1, 1));
     ASSERT_TRUE(cachedImage);
     ImageDecodingStore::instance()->clear();
     EXPECT_EQ(1u, ImageDecodingStore::instance()->cacheEntries());
 
     unlockCache(cachedImage);
     EXPECT_EQ(1u, ImageDecodingStore::instance()->cacheEntries());
 }
 
 } // namespace