Define clear regions in terms of GrFixedClip

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 993bb56f9efc4e936a4f0860dfafa4ddc47ee57e..5a8d22946ea871f8d2062eebfa52f9c7e84d9090 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -25,6 +25,7 @@ class GrDrawContextPriv;
 class GrDrawPathBatchBase;
 class GrDrawingManager;
 class GrDrawTarget;
+class GrFixedClip;
 class GrPaint;
 class GrPathProcessor;
 class GrPipelineBuilder;
@@ -339,6 +340,8 @@ private:
     friend class GrStencilAndCoverPathRenderer;  // for access to drawBatch
     friend class GrTessellatingPathRenderer;     // for access to drawBatch
 
+    void internalClear(const GrFixedClip&, const GrColor, bool canIgnoreClip);
+
     bool drawFilledDRRect(const GrClip& clip,
                           const GrPaint& paint,
                           const SkMatrix& viewMatrix,