Optimization for image decoding using Skia discardable memory

Source/platform/graphics/ImageFrameGeneratorTest.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 32 matching lines @@
 
 } // namespace
 
 class ImageFrameGeneratorTest : public ::testing::Test, public MockImageDecoderClient {
 public:
     virtual void SetUp() OVERRIDE
     {
         ImageDecodingStore::initializeOnce();
         ImageDecodingStore::instance()->setImageCachingEnabled(true);
         m_data = SharedBuffer::create();
-        m_generator = ImageFrameGenerator::create(fullSize(), m_data, true);
+        m_generator = ImageFrameGenerator::create(fullSize(), m_data, false);
         useMockImageDecoderFactory();
         m_decodersDestroyed = 0;
         m_frameBufferRequestCount = 0;
         m_status = ImageFrame::FrameEmpty;
     }
 
     virtual void TearDown() OVERRIDE
     {
         ImageDecodingStore::shutdown();
     }
@@ skipping 74 matching lines @@
     EXPECT_EQ(fullSize(), tempImage->scaledSize());
     EXPECT_TRUE(m_generator->hasAlpha(0));
     ImageDecodingStore::instance()->unlockCache(m_generator.get(), tempImage);
     EXPECT_EQ(0, m_frameBufferRequestCount);
 }
 
 TEST_F(ImageFrameGeneratorTest, cacheMissWithIncompleteDecode)
 {
     setFrameStatus(ImageFrame::FramePartial);
 
-    const ScaledImageFragment* tempImage= m_generator->decodeAndScale(fullSize());
+    const ScaledImageFragment* tempImage = m_generator->decodeAndScale(fullSize());
     EXPECT_FALSE(tempImage->isComplete());
     EXPECT_EQ(1, m_frameBufferRequestCount);
     ImageDecodingStore::instance()->unlockCache(m_generator.get(), tempImage);
     EXPECT_EQ(2, ImageDecodingStore::instance()->cacheEntries());
     EXPECT_EQ(1, ImageDecodingStore::instance()->imageCacheEntries());
     EXPECT_EQ(1, ImageDecodingStore::instance()->decoderCacheEntries());
 
     addNewData();
     tempImage = m_generator->decodeAndScale(fullSize());
     EXPECT_FALSE(tempImage->isComplete());
@@ skipping 163 matching lines @@
             // We have tested failures of all stages. This time all allocations
             // were successful.
             EXPECT_TRUE(image);
             break;
         }
         EXPECT_FALSE(image);
     }
 }
 
 } // namespace WebCore