Enable stencil clipping in mixed sampled render targets

include/gpu/GrRenderTarget.h

Index: include/gpu/GrRenderTarget.h
diff --git a/include/gpu/GrRenderTarget.h b/include/gpu/GrRenderTarget.h
index 2309dbd876f6cf4e9d58b715730088045e83fb65..24ca6603db0f0e13bb420165604e58fa0c31f787 100644
--- a/include/gpu/GrRenderTarget.h
+++ b/include/gpu/GrRenderTarget.h
@@ -81,6 +81,13 @@ public:
     }
 
     /**
+     * @return the number of actual raster samples-per-pixel, or zero if non-MSAA.
+     */
+    int numRasterSamples() const {
+        return fStencilAttachment ? this->numStencilSamples() : this->numColorSamples();
+    }
+
+    /**
      * @return true if the surface is mixed sampled, false otherwise.
      */
     bool hasMixedSamples() const {
@@ -175,6 +182,11 @@ private:
 
     GrStencilAttachment*  fStencilAttachment;
     SampleConfig          fSampleConfig;
+    // Configures sample locations to be either default or programmable, if MSAA.
+    bool                  fProgrammableSampleLocationsEnabled;
+    // True if sample locations colocated at pixel center are currently in use, false if default
+    // sample locations are currently in use.
+    bool                  fUsesCenteredSampleLocations;
 
     SkIRect               fResolveRect;