Add new bench for occluded blurmaskfilter draws

tools/sk_tool_utils.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef sk_tool_utils_DEFINED
 #define sk_tool_utils_DEFINED
 
 #include "SkColor.h"
 #include "SkImageEncoder.h"
 #include "SkImageInfo.h"
 #include "SkPixelSerializer.h"
 #include "SkRandom.h"
 #include "SkTDArray.h"
 #include "SkTypeface.h"
 
 class SkBitmap;
 class SkCanvas;
 class SkPaint;
 class SkPath;
+class SkRRect;
 class SkShader;
 class SkTestFont;
 class SkTextBlobBuilder;
 
 namespace sk_tool_utils {
 
     const char* colortype_name(SkColorType);
 
     /**
      * Map opaque colors from 8888 to 565.
@@ skipping 90 matching lines @@
     void create_frustum_normal_map(SkBitmap* bm, const SkIRect& dst);
 
     void create_tetra_normal_map(SkBitmap* bm, const SkIRect& dst);
 
     void make_big_path(SkPath& path);
 
     // Return a blurred version of 'src'. This doesn't use a separable filter
     // so it is slow!
     SkBitmap slow_blur(const SkBitmap& src, float sigma);
 
+    SkRect compute_central_occluder(const SkRRect& rr);
+
     // A helper object to test the topological sorting code (TopoSortBench.cpp & TopoSortTest.cpp)
     class TopoTestNode {
     public:
         TopoTestNode(int id) : fID(id), fOutputPos(-1), fTempMark(false) { }
 
         void dependsOn(TopoTestNode* src) {
             *fDependencies.append() = src;
         }
 
         int id() const { return fID; }
@@ skipping 73 matching lines @@
         int  fID;
         int  fOutputPos;
         bool fTempMark;
 
         SkTDArray<TopoTestNode*> fDependencies;
     };
 
 }  // namespace sk_tool_utils
 
 #endif  // sk_tool_utils_DEFINED