Add image color space histograms

third_party/WebKit/Source/platform/graphics/BitmapImageMetrics.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/BitmapImageMetrics.h"
 
 #include "platform/Histogram.h"
 #include "wtf/Threading.h"
 #include "wtf/text/WTFString.h"
 
@@ skipping 24 matching lines @@
 
 void BitmapImageMetrics::countImageOrientation(
     const ImageOrientationEnum orientation) {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(
       EnumerationHistogram, orientationHistogram,
       new EnumerationHistogram("Blink.DecodedImage.Orientation",
                                ImageOrientationEnumEnd));
   orientationHistogram.count(orientation);
 }
 
-void BitmapImageMetrics::countGamma(SkColorSpace* colorSpace) {
+void BitmapImageMetrics::countImageGamma(SkColorSpace* colorSpace) {
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(
+      EnumerationHistogram, gammaNamedHistogram,
+      new EnumerationHistogram("Blink.ColorSpace.Source", GammaEnd));
+  gammaNamedHistogram.count(getColorSpaceGamma(colorSpace));
+}
+
+void BitmapImageMetrics::countOutputGamma(SkColorSpace* colorSpace) {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(
       EnumerationHistogram, gammaNamedHistogram,
       new EnumerationHistogram("Blink.ColorSpace.Destination", GammaEnd));
+  gammaNamedHistogram.count(getColorSpaceGamma(colorSpace));
+}
 
+BitmapImageMetrics::Gamma BitmapImageMetrics::getColorSpaceGamma(
+    SkColorSpace* colorSpace) {
+  Gamma gamma = GammaNull;
   if (colorSpace) {
-    Gamma gamma;
     if (colorSpace->gammaCloseToSRGB()) {
       gamma = GammaSRGB;
     } else if (colorSpace->gammaIsLinear()) {
       gamma = GammaLinear;
     } else {
       gamma = GammaNonStandard;
     }
-
-    gammaNamedHistogram.count(gamma);
-  } else {
-    gammaNamedHistogram.count(GammaNull);
   }
+  return gamma;
 }
 
 }  // namespace blink