Add optimization for CHROMIUM_subscribe_uniform extension.

content/browser/gpu/gpu_process_host.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_GPU_GPU_PROCESS_HOST_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_
 
 #include <map>
 #include <queue>
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time/time.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_memory_uma_stats.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/common/gpu/gpu_result_codes.h"
 #include "content/public/browser/browser_child_process_host_delegate.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "gpu/command_buffer/common/constants.h"
+#include "gpu/command_buffer/common/value_state.h"
 #include "gpu/config/gpu_info.h"
 #include "ipc/ipc_sender.h"
 #include "ipc/message_filter.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 #include "url/gurl.h"
 
 struct GPUCreateCommandBufferConfig;
 
@@ skipping 43 matching lines @@
   static void GetProcessHandles(
       const GpuDataManager::GetGpuProcessHandlesCallback& callback);
 
   // Helper function to send the given message to the GPU process on the IO
   // thread.  Calls Get and if a host is returned, sends it.  Can be called from
   // any thread.  Deletes the message if it cannot be sent.
   CONTENT_EXPORT static void SendOnIO(GpuProcessKind kind,
                                       CauseForGpuLaunch cause,
                                       IPC::Message* message);
 
+  CONTENT_EXPORT static void SendUpdateValueStateOnIO(

[Tom Sepez, 2014/12/04 22:08:10]

nit: I'd prefer if this were named SendUpdateValueStateOnIOThread(). Your call.

[orglofch, 2014/12/04 23:37:10]

Done.

+      int client_id, unsigned int target, const gpu::ValueState& state);
+
   CONTENT_EXPORT static void RegisterGpuMainThreadFactory(
       GpuMainThreadFactoryFunction create);
 
   // Get the GPU process host for the GPU process with the given ID. Returns
   // null if the process no longer exists.
   static GpuProcessHost* FromID(int host_id);
   int host_id() const { return host_id_; }
 
   // IPC::Sender implementation.
   bool Send(IPC::Message* msg) override;
@@ skipping 36 matching lines @@
   GpuProcessKind kind();
 
   void ForceShutdown();
 
   void BeginFrameSubscription(
       int surface_id,
       base::WeakPtr<RenderWidgetHostViewFrameSubscriber> subscriber);
   void EndFrameSubscription(int surface_id);
   void LoadedShader(const std::string& key, const std::string& data);
 
+  void SendUpdateValueState(int client_id,
+                            unsigned int target,
+                            const gpu::ValueState& state);
+
  private:
   static bool ValidateHost(GpuProcessHost* host);
 
   GpuProcessHost(int host_id, GpuProcessKind kind);
   ~GpuProcessHost() override;
 
   bool Init();
 
   // Post an IPC message to the UI shim's message handler on the UI thread.
   void RouteOnUIThread(const IPC::Message& message);
@@ skipping 17 matching lines @@
   void OnDidDestroyOffscreenContext(const GURL& url);
   void OnGpuMemoryUmaStatsReceived(const GPUMemoryUmaStats& stats);
 #if defined(OS_MACOSX)
   void OnAcceleratedSurfaceBuffersSwapped(const IPC::Message& message);
 #endif
 
   void CreateChannelCache(int32 client_id);
   void OnDestroyChannel(int32 client_id);
   void OnCacheShader(int32 client_id, const std::string& key,
                      const std::string& shader);
+  void OnAddSubscription(unsigned int target);
+  void OnRemoveSubscription(unsigned int target);
 
   bool LaunchGpuProcess(const std::string& channel_id);
 
   void SendOutstandingReplies();
 
   void BlockLiveOffscreenContexts();
 
   // Update GPU crash counters.  Disable GPU if crash limit is reached.
   void RecordProcessCrash();
 
@@ skipping 77 matching lines @@
 
   std::string shader_prefix_key_;
 
   // Keep an extra reference to the SurfaceRef stored in the GpuSurfaceTracker
   // in this map so that we don't destroy it whilst the GPU process is
   // drawing to it.
   typedef std::multimap<int, scoped_refptr<GpuSurfaceTracker::SurfaceRef> >
       SurfaceRefMap;
   SurfaceRefMap surface_refs_;
 
+  // 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_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_H_