Add image color space histograms

third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp

Index: third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
index 327db4bc499b48345e2c0633a66afe98dcc50e4a..9f3b51f239e362b394ac74771e2071e65234e7c6 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
@@ -174,6 +174,11 @@ ImageFrame* ImageDecoder::frameBufferAtIndex(size_t index) {
     PlatformInstrumentation::didDecodeImage();
   }
 
+  if (!m_hasHistogrammedColorSpace) {
+    BitmapImageMetrics::countImageGamma(m_embeddedColorSpace.get());
+    m_hasHistogrammedColorSpace = true;
+  }
+
   frame->notifyBitmapIfPixelsChanged();
   return frame;
 }
@@ -355,7 +360,7 @@ void ImageDecoder::setTargetColorProfile(const WebVector<char>& profile) {
       SkColorSpace::MakeICC(profile.data(), profile.size()).release();
 
   // UMA statistics.
-  BitmapImageMetrics::countGamma(gTargetColorSpace);
+  BitmapImageMetrics::countOutputGamma(gTargetColorSpace);
 }
 
 sk_sp<SkColorSpace> ImageDecoder::colorSpace() const {
@@ -382,6 +387,7 @@ void ImageDecoder::setColorProfileAndComputeTransform(const char* iccData,
 void ImageDecoder::setColorSpaceAndComputeTransform(
     sk_sp<SkColorSpace> colorSpace) {
   DCHECK(!m_ignoreColorSpace);
+  DCHECK(!m_hasHistogrammedColorSpace);
 
   m_embeddedColorSpace = colorSpace;