Add support for Animated PNG

third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 388 matching lines @@
   premulFrame = premulDecoder->frameBufferAtIndex(0);
   EXPECT_TRUE(premulFrame &&
               premulFrame->getStatus() == ImageFrame::FrameComplete);
   EXPECT_EQ(premulFrame->bitmap().alphaType(), kOpaque_SkAlphaType);
   unpremulFrame = unpremulDecoder->frameBufferAtIndex(0);
   EXPECT_TRUE(unpremulFrame &&
               unpremulFrame->getStatus() == ImageFrame::FrameComplete);
   EXPECT_EQ(unpremulFrame->bitmap().alphaType(), kOpaque_SkAlphaType);
 }
 
+namespace {
+// Needed to exercise ImageDecoder::setMemoryAllocator, but still does the
+// default allocation.
+class Allocator final : public SkBitmap::Allocator {
+  bool allocPixelRef(SkBitmap* dst, SkColorTable* ctable) override {
+    return dst->tryAllocPixels(ctable);
+  }
+};
+}
+
+// Ensure that calling setMemoryAllocator does not short-circuit
+// initializeNewFrame.
+TEST(GIFImageDecoderTest, externalAllocator) {
+  auto data = readFile(layoutTestResourcesDir, "boston.gif");
+  ASSERT_TRUE(data.get());
+
+  auto decoder = createDecoder();
+  decoder->setData(data.get(), true);
+
+  Allocator allocator;
+  decoder->setMemoryAllocator(&allocator);
+  EXPECT_EQ(1u, decoder->frameCount());
+  ImageFrame* frame = decoder->frameBufferAtIndex(0);
+  decoder->setMemoryAllocator(nullptr);
+
+  ASSERT_TRUE(frame);
+  EXPECT_EQ(IntRect(IntPoint(), decoder->size()), frame->originalFrameRect());
+  EXPECT_FALSE(frame->hasAlpha());
+}
+
 }  // namespace blink