Add a background timing thread to kilobench

include/gpu/gl/SkGLContext.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 SkGLContext_DEFINED
 #define SkGLContext_DEFINED
 
@@ skipping 47 matching lines @@
      * testing that are small and not meant to be rendered to the screen).
      *
      * If the platform supports fence sync (OpenGL 3.2+ or EGL_KHR_fence_sync),
      * this will not swap any buffers, but rather emulate triple buffer
      * synchronization using fences.
      *
      * Otherwise it will call the platform SwapBuffers method. This may or may
      * not perform some sort of synchronization, depending on whether the
      * drawing surface provided by the platform is double buffered.
      */
-    void swapBuffers();
+    void swapBuffers(bool usePlatformSwapBuffers = false);

[bsalomon, 2016/01/20 18:54:52]

Can we just undo the swap-as-fence-sync hack before landing this?

Maybe give tools that are relying on this method an alternative
(waitOnSyncOrSwap()?) that  has the old behavior?

 
     /**
      * This notifies the context that we are deliberately testing abandoning
      * the context. It is useful for debugging contexts that would otherwise
      * test that GPU resources are properly deleted. It also allows a debugging
      * context to test that further GL calls are not made by Skia GPU code.
      */
     void testAbandon();
 
     /**
      * Creates a new GL context of the same type and makes the returned context current
      * (if not null).
      */
     virtual SkGLContext* createNew() const { return nullptr; }
 
     class GLFenceSync;  // SkGpuFenceSync implementation that uses the OpenGL functionality.
 
+    /*
+     * returns the fencesync object owned by this SkGLContext
+     */
+    SkGpuFenceSync* fenceSync() { return fFenceSync.get(); }
+
 protected:
     SkGLContext();
 
     /*
      * Methods that sublcasses must call from their constructors and destructors.
      */
     void init(const GrGLInterface*, SkGpuFenceSync* = NULL);
     void teardown();
 
     /*
@@ skipping 33 matching lines @@
  * SK_GL(glCtx, GenTextures(1, &texID));
  */
 #define SK_GL(ctx, X) (ctx).gl()->fFunctions.f ## X;    \
                       SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
 #define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X;    \
                   SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
 #define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->fFunctions.f ## X
 #define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X
 
 #endif