aura: Ensure OwnedMailbox not used with invalid or destroyed GLHelper.

cc/test/test_context_support.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/test_context_support.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 
 namespace cc {
 
 TestContextSupport::TestContextSupport()
     : last_swap_type_(NO_SWAP),
       weak_ptr_factory_(this) {
 }
 
 TestContextSupport::~TestContextSupport() {}
 
 void TestContextSupport::SignalSyncPoint(uint32 sync_point,
                                          const base::Closure& callback) {
   sync_point_callbacks_.push_back(callback);
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&TestContextSupport::CallAllSyncPointCallbacks,
+                 weak_ptr_factory_.GetWeakPtr()));
 }
 
 void TestContextSupport::SignalQuery(uint32 query,
                                      const base::Closure& callback) {
   sync_point_callbacks_.push_back(callback);
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&TestContextSupport::CallAllSyncPointCallbacks,
+                 weak_ptr_factory_.GetWeakPtr()));
 }
 
 void TestContextSupport::SetSurfaceVisible(bool visible) {
   if (!set_visible_callback_.is_null()) {
     set_visible_callback_.Run(visible);
   }
 }
 
 void TestContextSupport::SendManagedMemoryStats(
     const gpu::ManagedMemoryStats& stats) {}
 
 void TestContextSupport::CallAllSyncPointCallbacks() {
   for (size_t i = 0; i < sync_point_callbacks_.size(); ++i) {
     base::MessageLoop::current()->PostTask(
         FROM_HERE, sync_point_callbacks_[i]);
   }
   sync_point_callbacks_.clear();
 }
 
 void TestContextSupport::SetSurfaceVisibleCallback(
     const SurfaceVisibleCallback& set_visible_callback) {
   set_visible_callback_ = set_visible_callback;
 }
 
 void TestContextSupport::Swap() {
   last_swap_type_ = SWAP;
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&TestContextSupport::OnSwapBuffersComplete,
                             weak_ptr_factory_.GetWeakPtr()));
-  CallAllSyncPointCallbacks();
 }
 
 void TestContextSupport::PartialSwapBuffers(gfx::Rect sub_buffer) {
   last_swap_type_ = PARTIAL_SWAP;
   last_partial_swap_rect_ = sub_buffer;
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&TestContextSupport::OnSwapBuffersComplete,
                             weak_ptr_factory_.GetWeakPtr()));
-  CallAllSyncPointCallbacks();
 }
 
 void TestContextSupport::SetSwapBuffersCompleteCallback(
     const base::Closure& callback) {
   swap_buffers_complete_callback_ = callback;
 }
 
 void TestContextSupport::OnSwapBuffersComplete() {
   if (!swap_buffers_complete_callback_.is_null())
     swap_buffers_complete_callback_.Run();
 }
 
 }  // namespace cc