Allow GMs ato be used as benchmarks. Make convex_poly_clip opt in.

gm/gm.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef skiagm_DEFINED
 #define skiagm_DEFINED
 
@@ skipping 31 matching lines @@
             kSkipPicture_Flag           = 1 << 1,
             kSkipPipe_Flag              = 1 << 2,
             kSkipPipeCrossProcess_Flag  = 1 << 3,
             kSkipTiled_Flag             = 1 << 4,
             kSkip565_Flag               = 1 << 5,
             kSkipScaledReplay_Flag      = 1 << 6,
             kSkipGPU_Flag               = 1 << 7,
             kSkipPDFRasterization_Flag  = 1 << 8,
 
             kGPUOnly_Flag               = 1 << 9,
+
+            kAsBench_Flag               = 1 << 10, // Run the GM as a benchmark in the bench tool
         };
 
         void draw(SkCanvas*);
         void drawBackground(SkCanvas*);
         void drawContent(SkCanvas*);
 
         SkISize getISize() { return this->onISize(); }
         const char* shortName();
 
         uint32_t getFlags() const {
@@ skipping 58 matching lines @@
         SkColor  fBGColor;
         bool     fCanvasIsDeferred; // work-around problem in srcmode.cpp
         bool     fHaveCalledOnceBeforeDraw;
         SkMatrix fStarterMatrix;
     };
 
     typedef SkTRegistry<GM*(*)(void*)> GMRegistry;
 }
 
 #endif