WebP animation: Loop once more than stored loop count.

third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp

Index: third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
index 898332b5e951c998d4d17d9678e955ae314db8f9..9cb2df5d8a0ff1a52a7f91848d1b627baa094f07 100644
--- a/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
@@ -227,12 +227,8 @@ bool WEBPImageDecoder::updateDemuxer()
             m_repetitionCount = WebPDemuxGetI(m_demux, WEBP_FF_LOOP_COUNT);
             // Repetition count is always <= 16 bits.
             ASSERT(m_repetitionCount == (m_repetitionCount & 0xffff));
-            // Repetition count is the number of animation cycles to show,
-            // where 0 means "infinite". But ImageSource::repetitionCount()
-            // returns -1 for "infinite", and 0 and up for "show the image
-            // animation one cycle more than the value". Subtract one here
-            // to correctly handle the finite and infinite cases.
-            --m_repetitionCount;
+            if (!m_repetitionCount)
+                m_repetitionCount = cAnimationLoopInfinite;
             // FIXME: Implement ICC profile support for animated images.
             m_formatFlags &= ~ICCP_FLAG;
         }