Add histograms for animated image types

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

Index: third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
index 307e6a4f93d4c67f6793c152bb4172390813ec37..60a3fa35c12bdcccebfd9aeac72bfdc586d8c10f 100644
--- a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageDecoder.cpp
@@ -25,10 +25,11 @@
 
 #include "platform/image-decoders/gif/GIFImageDecoder.h"
 
+#include <limits>
+#include "platform/graphics/BitmapImageMetrics.h"
 #include "platform/image-decoders/gif/GIFImageReader.h"
 #include "wtf/NotFound.h"
 #include "wtf/PtrUtil.h"
-#include <limits>
 
 namespace blink {
 
@@ -210,12 +211,19 @@ void GIFImageDecoder::clearFrameBuffer(size_t frameIndex) {
 }
 
 size_t GIFImageDecoder::decodeFrameCount() {
+  const bool alreadyParsedFrameTwo = m_reader && m_reader->imagesCount() > 1;
   parse(GIFFrameCountQuery);
   // If decoding fails, |m_reader| will have been destroyed.  Instead of
   // returning 0 in this case, return the existing number of frames.  This way
   // if we get halfway through the image before decoding fails, we won't
   // suddenly start reporting that the image has zero frames.
-  return failed() ? m_frameBufferCache.size() : m_reader->imagesCount();
+  if (failed())
+    return m_frameBufferCache.size();
+
+  const size_t newCount = m_reader->imagesCount();
+  if (!alreadyParsedFrameTwo && newCount > 1)
+    BitmapImageMetrics::countAnimatedImageType(BitmapImageMetrics::AnimatedGIF);
+  return newCount;
 }
 
 void GIFImageDecoder::initializeNewFrame(size_t index) {