Adding support for per vertex opacity on textured layer

cc/texture_layer_impl.h

 // Copyright 2012 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.
 
 #ifndef CC_TEXTURE_LAYER_IMPL_H_
 #define CC_TEXTURE_LAYER_IMPL_H_
 
 #include "cc/cc_export.h"
 #include "cc/layer_impl.h"
 
@@ skipping 14 matching lines @@
     virtual void didLoseOutputSurface() OVERRIDE;
 
     virtual void dumpLayerProperties(std::string*, int indent) const OVERRIDE;
 
     unsigned textureId() const { return m_textureId; }
     void setTextureId(unsigned id) { m_textureId = id; }
     void setPremultipliedAlpha(bool premultipliedAlpha) { m_premultipliedAlpha = premultipliedAlpha; }
     void setFlipped(bool flipped) { m_flipped = flipped; }
     void setUVRect(const gfx::RectF& rect) { m_uvRect = rect; }
 
+    // 1--2
+    // |  |
+    // 0--3
+    void setVertexOpacity(const float vertexOpacity[4]);
+
 private:
     TextureLayerImpl(LayerTreeImpl* treeImpl, int id);
 
     virtual const char* layerTypeAsString() const OVERRIDE;
 
     unsigned m_textureId;
     ResourceProvider::ResourceId m_externalTextureResource;
     bool m_premultipliedAlpha;
     bool m_flipped;
     gfx::RectF m_uvRect;
+    float m_vertexOpacity[4];
 };
 
 }
 
 #endif  // CC_TEXTURE_LAYER_IMPL_H_