Adding support for per vertex opacity on textured layer

cc/texture_layer_impl.h

Index: cc/texture_layer_impl.h
diff --git a/cc/texture_layer_impl.h b/cc/texture_layer_impl.h
index 30262dacf0124cb884b097dae4d74b59ad09871c..47e9ca5686364fc635dbf8125c93cac023ff29b5 100644
--- a/cc/texture_layer_impl.h
+++ b/cc/texture_layer_impl.h
@@ -32,6 +32,11 @@ public:
     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);
 
@@ -42,6 +47,7 @@ private:
     bool m_premultipliedAlpha;
     bool m_flipped;
     gfx::RectF m_uvRect;
+    float m_vertexOpacity[4];
 };
 
 }