Refactor GL bindings so there is no global GLApi or DriverGL.

gpu/command_buffer/service/mailbox_manager_sync.cc

 // Copyright 2014 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 "gpu/command_buffer/service/mailbox_manager_sync.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <queue>
@@ skipping 20 matching lines @@
 typedef std::map<SyncToken, std::unique_ptr<gl::GLFence>> SyncTokenToFenceMap;
 base::LazyInstance<SyncTokenToFenceMap> g_sync_point_to_fence =
     LAZY_INSTANCE_INITIALIZER;
 base::LazyInstance<std::queue<SyncTokenToFenceMap::iterator>> g_sync_points =
     LAZY_INSTANCE_INITIALIZER;
 #endif
 
 void CreateFenceLocked(const SyncToken& sync_token) {
 #if !defined(OS_MACOSX)
   g_lock.Get().AssertAcquired();
-  if (gl::GetGLImplementation() == gl::kGLImplementationMockGL)
+  if (gl::GetGLImplementation() == gl::kGLImplementationMockGL ||
+      gl::GetGLImplementation() == gl::kGLImplementationStubGL)
     return;
 
   std::queue<SyncTokenToFenceMap::iterator>& sync_points = g_sync_points.Get();
   SyncTokenToFenceMap& sync_point_to_fence = g_sync_point_to_fence.Get();
   if (sync_token.release_count()) {
     while (!sync_points.empty() &&
            sync_points.front()->second->HasCompleted()) {
       sync_point_to_fence.erase(sync_points.front());
       sync_points.pop();
     }
@@ skipping 292 matching lines @@
 
   if (!needs_update.empty()) {
     for (const TextureUpdatePair& pair : needs_update) {
       pair.second.UpdateTexture(pair.first);
     }
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu