clear stencil clip on draw target

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index 34b417cb13f36907bb80249aac384b4b62c8ad7e..8cc673ab64f48d9908498c16c003980baa18101a 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -271,6 +271,10 @@ public:
                        bool canIgnoreRect,
                        GrRenderTarget* renderTarget = NULL) SK_OVERRIDE;
 
+    virtual void clearStencilClip(const SkIRect& rect,
+                                  bool insideClip,
+                                  GrRenderTarget* renderTarget = NULL) SK_OVERRIDE;
+
     virtual void purgeResources() SK_OVERRIDE {
         // The clip mask manager can rebuild all its clip masks so just
         // get rid of them all.
@@ -294,11 +298,6 @@ public:
         return fResetTimestamp;
     }
 
-    // GrGpu subclass sets clip bit in the stencil buffer. The subclass is
-    // free to clear the remaining bits to zero if masked clears are more
-    // expensive than clearing all bits.
-    virtual void clearStencilClip(GrRenderTarget*, const SkIRect& rect, bool insideClip) = 0;
-
     enum PrivateDrawStateStateBits {
         kFirstBit = (GrDrawState::kLastPublicStateBit << 1),
 
@@ -415,6 +414,13 @@ private:
     virtual void onClear(GrRenderTarget*, const SkIRect* rect, GrColor color,
                          bool canIgnoreRect) = 0;
 
+
+    // Overridden by backend specific classes to perform a clear of the stencil clip bits.  This is
+    // ONLY used by the clip mask manager
+    virtual void onClearStencilClip(GrRenderTarget*,
+                                    const SkIRect& rect,
+                                    bool insideClip) = 0;
+
     // overridden by backend-specific derived class to perform the draw call.
     virtual void onGpuDraw(const DrawInfo&) = 0;
 
@@ -447,7 +453,7 @@ private:
     // backend-specific flush of the state.
     // returns false if current state is unsupported.
     virtual bool flushGraphicsState(DrawType,
-                                    const ScissorState&,
+                                    const GrClipMaskManager::ScissorState&,
                                     const GrDeviceCoordTexture* dstCopy) = 0;
 
     // clears target's entire stencil buffer to 0