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 807ed8788e00414a4fd016c3a03ed18c9c465c4c..8054db923bfa51217b333fa922f65738feed931f 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -168,7 +168,8 @@ private:
     // Flushes state from GrPipeline to GL. Returns false if the state couldn't be set.
     // TODO we only have need to know if this is a line draw for flushing AA state on some buggy
     // hardware.  Evaluate if this is really necessary anymore
-    bool flushGLState(const DrawArgs&, bool isLineDraw);
+    bool flushGLState(const DrawArgs&, bool isLineDraw,
+                      GrSampleConfig sampleConfig = kUnified_GrSampleConfig);
 
     // Sets up vertex attribute pointers and strides. On return indexOffsetInBytes gives the offset
     // an into the index buffer. It does not account for drawInfo.startIndex() but rather the start
@@ -270,7 +271,8 @@ private:
     void setViewport(const GrGLIRect& viewport);
 
     void flushStencil(const GrStencilSettings&);
-    void flushHWAAState(GrRenderTarget* rt, bool useHWAA, bool isLineDraw);
+    void flushHWAAState(GrRenderTarget* rt, bool useHWAA, bool isLineDraw,
+                        GrSampleConfig sampleConfig = kUnified_GrSampleConfig);
 
     bool configToGLFormats(GrPixelConfig config,
                            bool getSizedInternal,