skpbench: add option for gpu timing

tools/gpu/gl/GLTestContext.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GLTestContext_DEFINED
 #define GLTestContext_DEFINED
 
@@ skipping 61 matching lines @@
     virtual GrGLFuncPtr onPlatformGetProcAddress(const char *) const = 0;
 
 private:
     class GLFenceSync;  // SkGpuFenceSync implementation that uses the OpenGL functionality.
 
     /** Subclass provides the gl interface object if construction was
      *  successful. */
     SkAutoTUnref<const GrGLInterface> fGL;
 
     friend class GLFenceSync;  // For onPlatformGetProcAddress.
+    friend class GLGpuTimer;   // For onPlatformGetProcAddress.
 
     typedef TestContext INHERITED;
 };
 
 /**
  * Creates platform-dependent GL context object.  The shareContext parameter is in an optional
  * context with which to share display lists. This should be a pointer to an GLTestContext created
  * with SkCreatePlatformGLTestContext.  NULL indicates that no sharing is to take place. Returns a
  * valid gl context object or NULL if such can not be created.
  */
 GLTestContext* CreatePlatformGLTestContext(GrGLStandard forcedGpuAPI,
                                            GLTestContext *shareContext = nullptr);
 
 }  // namespace sk_gpu_test
 #endif