Adding YUVA support for enabling Alpha Playback

cc/output/shader.h

Index: cc/output/shader.h
diff --git a/cc/output/shader.h b/cc/output/shader.h
index 3772a87ac3b1e65efdd333aba6c67c5096b02716..9e822f7947d6566de8c21fb130b7136456ce8ed9 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -390,7 +390,7 @@ class FragmentShaderYUVVideo {
   FragmentShaderYUVVideo();
   std::string GetShaderString() const;
 
-  void Init(WebKit::WebGraphicsContext3D*,
+  void Init(WebKit::WebGraphicsContext3D* context,
             unsigned program,
             bool using_bind_uniform,
             int* base_uniform_index);
@@ -412,6 +412,37 @@ class FragmentShaderYUVVideo {
   DISALLOW_COPY_AND_ASSIGN(FragmentShaderYUVVideo);
 };
 
+
+class FragmentShaderYUVAVideo {
+ public:
+  FragmentShaderYUVAVideo();
+  std::string GetShaderString() const;
+
+  void Init(WebKit::WebGraphicsContext3D* context,
+            unsigned program,
+            bool using_bind_uniform,
+            int* base_uniform_index);
+
+  int y_texture_location() const { return y_texture_location_; }
+  int u_texture_location() const { return u_texture_location_; }
+  int v_texture_location() const { return v_texture_location_; }
+  int a_texture_location() const { return a_texture_location_; }
+  int alpha_location() const { return alpha_location_; }
+  int yuv_matrix_location() const { return yuv_matrix_location_; }
+  int yuv_adj_location() const { return yuv_adj_location_; }
+
+ private:
+  int y_texture_location_;
+  int u_texture_location_;
+  int v_texture_location_;
+  int a_texture_location_;
+  int alpha_location_;
+  int yuv_matrix_location_;
+  int yuv_adj_location_;
+
+  DISALLOW_COPY_AND_ASSIGN(FragmentShaderYUVAVideo);
+};
+
 class FragmentShaderColor {
  public:
   FragmentShaderColor();