Enable stencil clipping in 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 2387b44af61ff4d5915f75fe414d1f12b4e11cd7..dee201292e6576de533360e1451f82a30dc587bf 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -255,12 +255,16 @@ private:
     // ensures that such operations don't negatively interact with tracking bound textures.
     void setScratchTextureUnit();
 
+    // colocates all samples at pixel center for render target, if MSAA.
+    // allows drawing coverage based AA shapes in MSAA mode.
+    void setColocatedSampleLocations(GrRenderTarget* rt, bool useColocatedSampleLocations);
+
     // bounds is region that may be modified and therefore has to be resolved.
     // nullptr means whole target. Can be an empty rect.
     void flushRenderTarget(GrGLRenderTarget*, const SkIRect* bounds);
 
     void flushStencil(const GrStencilSettings&);
-    void flushHWAAState(GrRenderTarget* rt, bool useHWAA);
+    void flushHWAAState(GrRenderTarget* rt, bool useHWAA, bool stencilEnabled);
 
     bool configToGLFormats(GrPixelConfig config,
                            bool getSizedInternal,