separate coverage stages from color stages.

Review URL: http://codereview.appspot.com/4538064/



git-svn-id: http://skia.googlecode.com/svn/trunk@1339 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrGLProgram.h b/gpu/src/GrGLProgram.h
index 74078e3..64d7088 100644
--- a/gpu/src/GrGLProgram.h
+++ b/gpu/src/GrGLProgram.h
@@ -99,6 +99,7 @@
             kUniform_ColorType      = 2,
         } fColorType;
 
+        int  fFirstCoverageStage;
         bool fEmitsPointSize;
         bool fUsesEdgeAA;