Add colorkey to gl clear operation

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
diff --git a/libs/surfaceflinger/LayerBase.h b/libs/surfaceflinger/LayerBase.h
index 7791941..2168de0 100644
--- a/libs/surfaceflinger/LayerBase.h
+++ b/libs/surfaceflinger/LayerBase.h
@@ -251,7 +251,9 @@
               uint32_t      transform;
               bool          dirty;
           };
-          
+
+          void clearWithOpenGL(const Region& clip, GLclampx r, GLclampx g,
+                               GLclampx b, GLclampx alpha) const;
           void clearWithOpenGL(const Region& clip) const;
           void drawWithOpenGL(const Region& clip, const Texture& texture) const;
           void loadTexture(Texture* texture, GLint textureName,