Implement SkGLContext swapBuffers with fence syncs

src/gpu/gl/SkNullGLContext.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/SkNullGLContext.h"
 #include "gl/GrGLInterface.h"
@@ skipping 529 matching lines @@
     if (!ctx->isValid()) {
         SkDELETE(ctx);
         return NULL;
     }
     return ctx;
 }
 
 SkNullGLContext::SkNullGLContext() {
     fState = SkNEW(ContextState);
     GrGLInterface* interface = create_null_interface(fState);
-    fGL.reset(interface);
+    this->init(interface);
 #if GR_GL_PER_GL_FUNC_CALLBACK
     interface->fCallback = set_current_context_from_interface;
     interface->fCallbackData = reinterpret_cast<GrGLInterfaceCallbackData>(fState);
 #endif
 }
 
 SkNullGLContext::~SkNullGLContext() {
-    fGL.reset(NULL);
+    this->teardown();
     fState->unref();
 }
 
-void SkNullGLContext::makeCurrent() const { set_current_context(fState); }
+void SkNullGLContext::onPlatformMakeCurrent() const { set_current_context(fState); }