Adding YUVA support for enabling Alpha Playback

cc/shader.h

Index: cc/shader.h
diff --git a/cc/shader.h b/cc/shader.h
index 2555313d7825f355cecf207696888d82de62588a..c21c356ee33d9677c690ce69d9ee0afc86c686de 100644
--- a/cc/shader.h
+++ b/cc/shader.h
@@ -370,6 +370,31 @@ private:
     int m_colorLocation;
 };
 
+class FragmentShaderYUVAVideo {
+public:
+    FragmentShaderYUVAVideo();
+    std::string getShaderString() const;
+
+    void init(WebKit::WebGraphicsContext3D*, unsigned program, bool usingBindUniform, int* baseUniformIndex);
+
+    int yTextureLocation() const { return m_yTextureLocation; }
+    int uTextureLocation() const { return m_uTextureLocation; }
+    int vTextureLocation() const { return m_vTextureLocation; }
+    int aTextureLocation() const { return m_aTextureLocation; }
+    int alphaLocation() const { return m_alphaLocation; }
+    int yuvMatrixLocation() const { return m_yuvMatrixLocation; }
+    int yuvAdjLocation() const { return m_yuvAdjLocation; }
+
+private:
+    int m_yTextureLocation;
+    int m_uTextureLocation;
+    int m_vTextureLocation;
+    int m_aTextureLocation;
+    int m_alphaLocation;
+    int m_yuvMatrixLocation;
+    int m_yuvAdjLocation;
+};
+
 class FragmentShaderCheckerboard {
 public:
     FragmentShaderCheckerboard();