Updated blur to use A8/R8 (instead of RGBA8) when available - this provides a performance gain for large blurs

http://codereview.appspot.com/5988071/



git-svn-id: http://skia.googlecode.com/svn/trunk@3647 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGpuGL.h b/src/gpu/gl/GrGpuGL.h
index 398a2fc..928b50e 100644
--- a/src/gpu/gl/GrGpuGL.h
+++ b/src/gpu/gl/GrGpuGL.h
@@ -233,6 +233,8 @@
                                    GrGLuint texID,
                                    GrGLRenderTarget::Desc* desc);
 
+    void fillInConfigRenderableTable();
+
     friend class GrGLVertexBuffer;
     friend class GrGLIndexBuffer;
     friend class GrGLTexture;