Fix directly composited image path for CSS image-orientation

third_party/WebKit/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1845 matching lines @@
 
     LayoutImage* imageLayoutObject = toLayoutImage(layoutObject);
     if (ImageResource* cachedImage = imageLayoutObject->cachedImage()) {
         if (!cachedImage->hasImage())
             return false;
 
         Image* image = cachedImage->imageForLayoutObject(imageLayoutObject);
         if (!image->isBitmapImage())
             return false;
 
-        // FIXME: We should be able to handle bitmap images using direct compositing
-        // no matter what image-orientation value. See crbug.com/502267
-        if (imageLayoutObject->style()->respectImageOrientation() != RespectImageOrientation)
-            return true;
+        return true;

[Noel Gordon, 2015/09/25 00:12:19]

Very cool, and I can see why layout tests are passing here, maybe because there
are no tests :)

We should add a test if none exists; an <img> with non-default orientation that
is in its own layer

<style>
   img { transform: translateZ(0); }
</style>

and perhaps another test that dynamically adds that CSS style to the <img>
element under test.

Note that since the current file is marked deprecated, and will be once
display-lists-v2 (SPv2) becomes a real thing, then their no layout test
regression policy will keep our tests working, no matter how they implement
layered images in SPv2.

Harder, bonus points test: make the image have a layer _and_ object-fit style. 
The later is an Opera contribution to CSS, but no layout test was ever added for
a layered <img>.  Shame really, and it is well-busted, but perhaps one of your
Opera colleagues could separately look at that issue,
https://code.google.com/p/chromium/issues/detail?id=518509 as penance.

     }
 
     return false;
 }
 
 void CompositedDeprecatedPaintLayerMapping::contentChanged(ContentChangeType changeType)
 {
     if ((changeType == ImageChanged) && layoutObject()->isImage() && isDirectlyCompositedImage()) {
         updateImageContents();
         return;
@@ skipping 504 matching lines @@
     } else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
         name = "Scrolling Block Selection Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink