Record UMA stats for Blink decoded image orientation

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

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 149 matching lines @@
         m_frames.grow(numFrames);
 
     int deltaBytes = totalFrameBytes();
 
 
     // We are caching frame snapshots.  This is OK even for partially decoded frames,
     // as they are cleared by dataChanged() when new data arrives.
     m_frames[index].m_frame = m_source.createFrameAtIndex(index);
 
     m_frames[index].m_orientation = m_source.orientationAtIndex(index);
+    Platform::current()->histogramEnumeration("Blink.DecodedImageOrientation", m_frames[index].m_orientation.orientation(), OriginLeftBottom + 1);

[Noel Gordon, 2015/11/10 01:14:56]

The actual image orientation is not known until isSizeAvailable.  Do it the way
urvang@ did it when recording UMA for the decoded image type.  

     m_frames[index].m_haveMetadata = true;
     m_frames[index].m_isComplete = m_source.frameIsCompleteAtIndex(index);
     if (repetitionCount(false) != cAnimationNone)
         m_frames[index].m_duration = m_source.frameDurationAtIndex(index);
     m_frames[index].m_hasAlpha = m_source.frameHasAlphaAtIndex(index);
     m_frames[index].m_frameBytes = m_source.frameBytesAtIndex(index);
 
     const IntSize frameSize(index ? m_source.frameSizeAtIndex(index) : m_size);
     if (frameSize != m_size)
         m_hasUniformFrameSize = false;
@@ skipping 483 matching lines @@
     destroyDecodedDataIfNecessary();
 
     // We need to draw this frame if we advanced to it while not skipping, or if
     // while trying to skip frames we hit the last frame and thus had to stop.
     if (skippingFrames != advancedAnimation)
         imageObserver()->animationAdvanced(this);
     return advancedAnimation;
 }
 
 } // namespace blink