Merge 92867 - [Chromium] Temporarily disable layer anti-aliasing on ChromeOS.

Source/WebCore/platform/graphics/chromium/LayerTilerChromium.cpp

 /*
  * Copyright (C) 2010 Google 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 359 matching lines @@
 void LayerTilerChromium::setLayerPosition(const IntPoint& layerPosition)
 {
     m_layerPosition = layerPosition;
 }
 
 void LayerTilerChromium::draw(const IntRect& contentRect, const TransformationMatrix& globalTransform, float opacity)
 {
     if (m_skipsDraw || !m_tiles.size() || contentRect.isEmpty())
         return;
 
+#if defined(OS_CHROMEOS)
+    // FIXME: Disable anti-aliasing to workaround broken driver.
+    bool useAA = false;
+#else
     // Use anti-aliasing programs when border texels are preset and transform
     // is not an integer translation.
     bool useAA = (m_tilingData.borderTexels() && !globalTransform.isIntegerTranslation());
+#endif
 
     switch (m_sampledTexelFormat) {
     case LayerTextureUpdater::SampledTexelFormatRGBA:
         if (useAA)
             drawTiles(contentRect, globalTransform, opacity, layerRenderer()->tilerProgramAA(), layerRenderer()->tilerProgramAA()->fragmentShader().fragmentTexTransformLocation(), layerRenderer()->tilerProgramAA()->fragmentShader().edgeLocation());
         else
             drawTiles(contentRect, globalTransform, opacity, layerRenderer()->tilerProgram(), -1, -1);
         break;
     case LayerTextureUpdater::SampledTexelFormatBGRA:
         if (useAA)
@@ skipping 262 matching lines @@
 
         prevEdgeY = edgeY;
         // Reverse direction.
         prevEdgeY.scale(-1, -1, -1);
     }
 }
 
 } // namespace WebCore
 
 #endif // USE(ACCELERATED_COMPOSITING)