Add optimization for CHROMIUM_subscribe_uniform extension.

content/browser/renderer_host/render_widget_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_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 43 matching lines @@
 
 namespace cc {
 class CompositorFrame;
 class CompositorFrameAck;
 }
 
 namespace gfx {
 class Range;
 }
 
+namespace gpu {
+union ValueState;
+class ValueStateMap;
+}
+
 namespace ui {
 class KeyEvent;
 }
 
 namespace blink {
 class WebInputEvent;
 class WebMouseEvent;
 struct WebCompositionUnderline;
 struct WebScreenInfo;
 }
@@ skipping 392 matching lines @@
       gfx::Size snapshot_size,
       scoped_refptr<base::RefCountedBytes> png_data);
 
   // LatencyComponents generated in the renderer must have component IDs
   // provided to them by the browser process. This function adds the correct
   // component ID where necessary.
   void AddLatencyInfoComponentIds(ui::LatencyInfo* latency_info);
 
   InputRouter* input_router() { return input_router_.get(); }
 
+  // Handlers for subscription target changes to update subscription_set_
+  void OnAddSubscription(unsigned int target);
+  void OnRemoveSubscription(unsigned int target);
+
   // Get the BrowserAccessibilityManager for the root of the frame tree,
   BrowserAccessibilityManager* GetRootBrowserAccessibilityManager();
 
   // Get the BrowserAccessibilityManager for the root of the frame tree,
   // or create it if it doesn't already exist.
   BrowserAccessibilityManager* GetOrCreateRootBrowserAccessibilityManager();
 
 #if defined(OS_WIN)
   gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif
@@ skipping 204 matching lines @@
   void WindowSnapshotReachedScreen(int snapshot_id);
 
   void OnSnapshotDataReceived(int snapshot_id,
                               const unsigned char* png,
                               size_t size);
 
   void OnSnapshotDataReceivedAsync(
       int snapshot_id,
       scoped_refptr<base::RefCountedBytes> png_data);
 
+  void SendUpdateValueState(unsigned int target, const gpu::ValueState& state);
+
   // Our delegate, which wants to know mainly about keyboard events.
   // It will remain non-NULL until DetachDelegate() is called.
   RenderWidgetHostDelegate* delegate_;
 
   // Created during construction but initialized during Init*(). Therefore, it
   // is guaranteed never to be NULL, but its channel may be NULL if the
   // renderer crashed, so you must always check that.
   RenderProcessHost* process_;
 
   // The ID of the corresponding object in the Renderer Instance.
@@ skipping 132 matching lines @@
 
   int64 last_input_number_;
 
   bool subscribe_uniform_enabled_;
 
   int next_browser_snapshot_id_;
   typedef std::map<int,
       base::Callback<void(const unsigned char*, size_t)> > PendingSnapshotMap;
   PendingSnapshotMap pending_browser_snapshots_;
 
+  // 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_;
+
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_