Remove redundant codepath for webgl api blocking

gpu/ipc/service/gpu_channel_manager.h

 // Copyright (c) 2012 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.
 
 #ifndef GPU_IPC_SERVICE_GPU_CHANNEL_MANAGER_H_
 #define GPU_IPC_SERVICE_GPU_CHANNEL_MANAGER_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 89 matching lines @@
                         const ValueState& state);
 #if defined(OS_ANDROID)
   void WakeUpGpu();
 #endif
   void DestroyAllChannels();
 
   // Remove the channel for a particular renderer.
   void RemoveChannel(int client_id);
 
   void LoseAllContexts();
+  void MaybeExitOnContextLost();
 
 #if defined(OS_MACOSX)
   void AddBufferPresentedCallback(int32_t routing_id,
                                   const BufferPresentedCallback& callback);
   void RemoveBufferPresentedCallback(int32_t routing_id);
   void BufferPresented(int32_t surface_id,
                        const base::TimeTicks& vsync_timebase,
                        const base::TimeDelta& vsync_interval);
 #endif
 
@@ skipping 19 matching lines @@
   uint32_t GetUnprocessedOrderNum() const;
 
   // Returns the maximum order number for processed IPC messages across all
   // channels.
   uint32_t GetProcessedOrderNum() const;
 
 #if defined(OS_ANDROID)
   void DidAccessGpu();
 #endif
 
+  bool is_exiting_for_lost_context() {
+    return exiting_for_lost_context_;
+  }
+
  protected:
   virtual scoped_ptr<GpuChannel> CreateGpuChannel(
       int client_id,
       uint64_t client_tracing_id,
       bool preempts,
       bool allow_view_command_buffers,
       bool allow_real_time_streams);
 
   SyncPointManager* sync_point_manager() const {
     return sync_point_manager_;
@@ skipping 49 matching lines @@
       framebuffer_completeness_cache_;
   scoped_refptr<gfx::GLSurface> default_offscreen_surface_;
   GpuMemoryBufferFactory* const gpu_memory_buffer_factory_;
 #if defined(OS_ANDROID)
   // Last time we know the GPU was powered on. Global for tracking across all
   // transport surfaces.
   base::TimeTicks last_gpu_access_time_;
   base::TimeTicks begin_wake_up_time_;
 #endif
 
+  // Set during intentional GPU process shutdown.
+  bool exiting_for_lost_context_;
+
   // Member variables should appear before the WeakPtrFactory, to ensure
   // that any WeakPtrs to Controller are invalidated before its members
   // variable's destructors are executed, rendering them invalid.
   base::WeakPtrFactory<GpuChannelManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelManager);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_GPU_CHANNEL_MANAGER_H_