Add can-ignore-rect hint to clear call

https://codereview.chromium.org/53823003/



git-svn-id: http://skia.googlecode.com/svn/trunk@12064 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrInOrderDrawBuffer.h b/src/gpu/GrInOrderDrawBuffer.h
index 275d7e0..6b680b2 100644
--- a/src/gpu/GrInOrderDrawBuffer.h
+++ b/src/gpu/GrInOrderDrawBuffer.h
@@ -71,6 +71,7 @@
                                int* indexCount) const SK_OVERRIDE;
     virtual void clear(const SkIRect* rect,
                        GrColor color,
+                       bool canIgnoreRect,
                        GrRenderTarget* renderTarget = NULL) SK_OVERRIDE;
 
     virtual void initCopySurfaceDstDesc(const GrSurface* src, GrTextureDesc* desc) SK_OVERRIDE;
@@ -117,6 +118,7 @@
 
         SkIRect         fRect;
         GrColor         fColor;
+        bool            fCanIgnoreRect;
         GrRenderTarget* fRenderTarget;
     };