GIF decoding: Add a unit test for repetition count

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

Index: third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp
index 88164b1a16260d92e972e6c35d53e2604f24e988..de57fd4d58f515122948bd22398a2057725598e9 100644
--- a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoderTest.cpp
@@ -500,4 +500,21 @@ TEST(GIFImageDecoderTest, firstFrameHasGreaterSizeThanScreenSize)
     }
 }
 
+TEST(GIFImageDecoderTest, verifyRepetitionCount)
+{
+    const int expectedRepetitionCount = 2;
+    OwnPtr<ImageDecoder> decoder = createDecoder();
+    RefPtr<SharedBuffer> data = readFile(layoutTestResourcesDir, "full2loop.gif");
+    ASSERT_TRUE(data.get());
+    decoder->setData(data.get(), true);
+    EXPECT_EQ(cAnimationLoopOnce, decoder->repetitionCount()); // Default value before decode.
+
+    ImageFrame* frame = decoder->frameBufferAtIndex(0);
+    EXPECT_EQ(ImageFrame::FrameComplete, frame->getStatus());
+    frame = decoder->frameBufferAtIndex(1);
+    EXPECT_EQ(ImageFrame::FrameComplete, frame->getStatus());
+

[Noel Gordon, 2016/03/11 00:39:50]

Are there 2, or 3, frames in the test GIF image?  Seems to me that there were 3
frames when I looked at test image in the Mac OSX image viewer tool.  Is that
tool wrong?

[urvang, 2016/03/11 01:13:49]

Yes, there are 3 frames, with repetition count of 2.

We are just testing the repetition count here.

+    EXPECT_EQ(expectedRepetitionCount, decoder->repetitionCount()); // Expected value after decode.
+}
+
 } // namespace blink