Implement support for mixed sampled render targets

src/gpu/gl/GrGLGpu.h

Index: src/gpu/gl/GrGLGpu.h
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index 6f7add6cd2676241609e85fd8a0eb8b40d595977..73842e6d34062a915545f8319a95d50d77fa3982 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -480,6 +480,7 @@ private:
     } fCopyProgram;
 
     TriState fMSAAEnabled;
+    TriState fCoverageModulationEnabled;

[Chris Dalton, 2015/06/09 17:39:52]

After discussions with the hardware guys, we can just leave coverage modulation
always enabled rather than tracking its state. It has no effect when not using
mixed samples.

 
     GrStencilSettings           fHWStencilSettings;
     TriState                    fHWStencilTestEnabled;