content/gpu: Simplify gpu channel message handling.

content/common/gpu/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 CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 64 matching lines @@
 
   // Remove the channel for a particular renderer.
   void RemoveChannel(int client_id);
 
   // Listener overrides.
   bool OnMessageReceived(const IPC::Message& msg) override;
 
   // Sender overrides.
   bool Send(IPC::Message* msg) override;
 
-  uint32_t ProcessedOrderNumber();
-  uint32_t UnprocessedOrderNumber();
-
   void LoseAllContexts();
 
   int GenerateRouteID();
   void AddRoute(int32 routing_id, IPC::Listener* listener);
   void RemoveRoute(int32 routing_id);
 
   gpu::gles2::ProgramCache* program_cache();
   gpu::gles2::ShaderTranslatorCache* shader_translator_cache();
   gpu::gles2::FramebufferCompletenessCache* framebuffer_completeness_cache();
 
   GpuMemoryManager* gpu_memory_manager() { return &gpu_memory_manager_; }
 
-  GpuChannel* LookupChannel(int32 client_id);
+  GpuChannel* LookupChannel(int32 client_id) const;
 
   gpu::SyncPointManager* sync_point_manager() {
     return sync_point_manager_;
   }
 
   gfx::GLSurface* GetDefaultOffscreenSurface();
 
   GpuMemoryBufferFactory* gpu_memory_buffer_factory() {
     return gpu_memory_buffer_factory_;
   }
 
+  // Increments the global order number used for IPC messages and returns the
+  // new value.
+  uint32_t GetNextUnprocessedOrderNum();
+
+  // Returns the current value of the global order number used for IPC messages.
+  uint32_t GetCurrentUnprocessedOrderNum() const;
+
+  // Returns the maximum order number for processed IPC messages across all
+  // channels.
+  uint32_t GetProcessedOrderNum() const;
+
  protected:
   virtual scoped_ptr<GpuChannel> CreateGpuChannel(
       gfx::GLShareGroup* share_group,
       gpu::gles2::MailboxManager* mailbox_manager,
       int client_id,
       uint64_t client_tracing_id,
       bool allow_future_sync_points,
       bool allow_real_time_streams);
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
@@ skipping 48 matching lines @@
   gpu::SyncPointManager* sync_point_manager_;
   scoped_ptr<gpu::gles2::ProgramCache> program_cache_;
   scoped_refptr<gpu::gles2::ShaderTranslatorCache> shader_translator_cache_;
   scoped_refptr<gpu::gles2::FramebufferCompletenessCache>
       framebuffer_completeness_cache_;
   scoped_refptr<gfx::GLSurface> default_offscreen_surface_;
   GpuMemoryBufferFactory* const gpu_memory_buffer_factory_;
   // Must outlive this instance of GpuChannelManager.
   IPC::AttachmentBroker* attachment_broker_;
 
+  uint32_t unprocessed_order_num_;
+  mutable base::Lock order_num_lock_;  // Guards unprocessed_order_num_.
+
   // 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 content
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_MANAGER_H_