Add MultiPictureDraw to nanobench

bench/SKPBench.h

Index: bench/SKPBench.h
diff --git a/bench/SKPBench.h b/bench/SKPBench.h
index 0b0e008d633b33598cf86b314e84bedb72ce1669..36d7dfd4cf5f7eb8aa36eb59e236e4730ed06038 100644
--- a/bench/SKPBench.h
+++ b/bench/SKPBench.h
@@ -17,14 +17,18 @@
  */
 class SKPBench : public Benchmark {
 public:
-    SKPBench(const char* name, const SkPicture*, const SkIRect& devClip, SkScalar scale);
+    SKPBench(const char* name, const SkPicture*, const SkIRect& devClip, SkScalar scale,
+             bool useMultiPictureDraw);
+    ~SKPBench() SK_OVERRIDE;
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE;
-    virtual const char* onGetUniqueName() SK_OVERRIDE;
-    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE;
-    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE;
-    virtual SkIPoint onGetSize() SK_OVERRIDE;
+    const char* onGetName() SK_OVERRIDE;
+    const char* onGetUniqueName() SK_OVERRIDE;
+    void onPerCanvasPreDraw(SkCanvas*) SK_OVERRIDE;
+    void onPerCanvasPostDraw(SkCanvas*) SK_OVERRIDE;
+    bool isSuitableFor(Backend backend) SK_OVERRIDE;
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE;
+    SkIPoint onGetSize() SK_OVERRIDE;
 
 private:
     SkAutoTUnref<const SkPicture> fPic;
@@ -33,6 +37,10 @@ private:
     SkString fName;
     SkString fUniqueName;
 
+    const bool fUseMultiPictureDraw;
+    SkTDArray<SkSurface*> fSurfaces;   // for MultiPictureDraw
+    SkTDArray<SkIRect> fTileRects;     // for MultiPictureDraw
+
     typedef Benchmark INHERITED;
 };