add SkCanvas::drawDRRect

src/pipe/SkGPipeWrite.cpp

Index: src/pipe/SkGPipeWrite.cpp
diff --git a/src/pipe/SkGPipeWrite.cpp b/src/pipe/SkGPipeWrite.cpp
index 17305bf24be76b4204dc5042af6a38f7d243363c..879ce8288b4ed8ce028572663bf4b3db3ab3ca1e 100644
--- a/src/pipe/SkGPipeWrite.cpp
+++ b/src/pipe/SkGPipeWrite.cpp
@@ -290,6 +290,10 @@ public:
      * according to slot.
      */
     bool shuttleBitmap(const SkBitmap&, int32_t slot);
+
+protected:
+    virtual void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) SK_OVERRIDE;
+
 private:
     enum {
         kNoSaveLayer = -1,
@@ -738,6 +742,17 @@ void SkGPipeCanvas::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
     }
 }
 
+void SkGPipeCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
+                                 const SkPaint& paint) {
+    NOTIFY_SETUP(this);
+    this->writePaint(paint);
+    if (this->needOpBytes(kSizeOfFlatRRect * 2)) {
+        this->writeOp(kDrawDRRect_DrawOp);
+        fWriter.writeRRect(outer);
+        fWriter.writeRRect(inner);
+    }
+}
+
 void SkGPipeCanvas::drawPath(const SkPath& path, const SkPaint& paint) {
     NOTIFY_SETUP(this);
     this->writePaint(paint);