Add optimization for CHROMIUM_subscribe_uniform extension.

content/browser/renderer_host/render_process_host_impl.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_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 15 matching lines @@
 
 namespace base {
 class CommandLine;
 class MessageLoop;
 }
 
 namespace gfx {
 class Size;
 }
 
+namespace gpu {
+class ValueStateMap;
+}
+
 namespace IPC {
 class ChannelMojoHost;
 }
 
 namespace content {
 class AudioRendererHost;
 class BrowserCdmManager;
 class BrowserDemuxerAndroid;
 class GpuMessageFilter;
 class MessagePortMessageFilter;
@@ skipping 87 matching lines @@
       base::Callback<void(const std::string&)> callback) override;
   WebRtcStopRtpDumpCallback StartRtpDump(
       bool incoming,
       bool outgoing,
       const WebRtcRtpPacketCallback& packet_callback) override;
 #endif
   void ResumeDeferredNavigation(const GlobalRequestID& request_id) override;
   void NotifyTimezoneChange() override;
   ServiceRegistry* GetServiceRegistry() override;
   const base::TimeTicks& GetInitTimeForNavigationMetrics() const override;
+  bool SubscribeUniformEnabled() const override;
+  void OnAddSubscription(unsigned int target) override;
+  void OnRemoveSubscription(unsigned int target) override;
+  void SendUpdateValueState(
+      unsigned int target, const gpu::ValueState& state) override;
 
   // IPC::Sender via RenderProcessHost.
   bool Send(IPC::Message* msg) override;
 
   // IPC::Listener via RenderProcessHost.
   bool OnMessageReceived(const IPC::Message& msg) override;
   void OnChannelConnected(int32 peer_pid) override;
   void OnChannelError() override;
   void OnBadMessageReceived(const IPC::Message& message) override;
 
@@ skipping 310 matching lines @@
 #endif
 
   int worker_ref_count_;
 
   // Records the time when the process starts surviving for workers for UMA.
   base::TimeTicks survive_for_worker_start_time_;
 
   // Context shared for each PermissionService instance created for this RPH.
   scoped_ptr<PermissionServiceContext> permission_service_context_;
 
+  // This is a set of all subscription targets valuebuffers in the GPU process
+  // are currently subscribed too. Used to prevent sending unnecessary
+  // ValueState updates.
+  typedef base::hash_set<unsigned int> SubscriptionSet;
+  SubscriptionSet subscription_set_;
+
+  // Maintains ValueStates which are not currently subscribed too so we can
+  // pass them to the GpuService if a Valuebuffer ever subscribes to the
+  // respective subscription target
+  scoped_refptr<gpu::ValueStateMap> pending_valuebuffer_state_;
+
+  // Whether or not the CHROMIUM_subscribe_uniform WebGL extension is enabled
+  bool subscribe_uniform_enabled_;
+
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_