Some fixes around GrContext::abandonContext:

include/gpu/gl/SkGLContextHelper.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 SkGLContextHelper_DEFINED
 #define SkGLContextHelper_DEFINED
 
@@ skipping 32 matching lines @@
      * targeted.  If the current surface does not include a back buffer, this
      * call has no effect.
      */
     virtual void swapBuffers() const = 0;
 
     bool hasExtension(const char* extensionName) const {
         SkASSERT(NULL != fGL);
         return fGL->hasExtension(extensionName);
     }
 
+    /**
+     * 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();
+
 protected:
     /**
      * Subclass implements this to make a GL context. The returned GrGLInterface
      * should be populated with functions compatible with the context. The
      * format and size of backbuffers does not matter since an FBO will be
      * created.
      */
     virtual const GrGLInterface* createGLContext(GrGLStandard forcedGpuAPI) = 0;
 
     /**
@@ skipping 15 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