Implement drawDRRect for GPU

BUG=skia:2259
R=jvanverth@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/220233011

git-svn-id: http://skia.googlecode.com/svn/trunk@14118 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrOvalRenderer.h b/src/gpu/GrOvalRenderer.h
index 9653fcc..92f6ff0 100644
--- a/src/gpu/GrOvalRenderer.h
+++ b/src/gpu/GrOvalRenderer.h
@@ -33,8 +33,10 @@
 
     bool drawOval(GrDrawTarget* target, const GrContext* context, bool useAA,
                   const SkRect& oval, const SkStrokeRec& stroke);
-    bool drawSimpleRRect(GrDrawTarget* target, GrContext* context, bool useAA,
-                         const SkRRect& rrect, const SkStrokeRec& stroke);
+    bool drawRRect(GrDrawTarget* target, GrContext* context, bool useAA,
+                   const SkRRect& rrect, const SkStrokeRec& stroke);
+    bool drawDRRect(GrDrawTarget* target, GrContext* context, bool useAA,
+                    const SkRRect& outer, const SkRRect& inner);
 
 private:
     bool drawEllipse(GrDrawTarget* target, bool useCoverageAA,