Mouse lock implementation, including the renderer side and the Windows version of the browser side.

content/browser/renderer_host/render_widget_host.h

Index: content/browser/renderer_host/render_widget_host.h
diff --git a/content/browser/renderer_host/render_widget_host.h b/content/browser/renderer_host/render_widget_host.h
index 16cfd97a11708a7fda64dc165537b3f56ff3f64d..1a56a7109d4c4a3afe4a72f1c424eb3381d27856 100644
--- a/content/browser/renderer_host/render_widget_host.h
+++ b/content/browser/renderer_host/render_widget_host.h
@@ -192,6 +192,9 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   void Blur();
   virtual void LostCapture();
 
+  // Called to notify the RenderWidget that it has lost the mouse lock.
+  virtual void LostMouseLock();
+
   // Tells us whether the page is rendered directly via the GPU process.
   bool is_accelerated_compositing_active() {
     return is_accelerated_compositing_active_;
@@ -421,6 +424,8 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   virtual void NotifyRendererUnresponsive() {}
   virtual void NotifyRendererResponsive() {}
 
+  bool IsMouseLocked() const;
+
  protected:
   // true if a renderer has once been valid. We use this flag to display a sad
   // tab only when we lose our renderer and not if a paint occurs during
@@ -467,6 +472,9 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
 
   void OnMsgDidActivateAcceleratedCompositing(bool activated);
 
+  void OnMsgLockMouse();
+  void OnMsgUnlockMouse();
+
 #if defined(OS_POSIX)
   void OnMsgGetScreenInfo(gfx::NativeViewId view,
                           WebKit::WebScreenInfo* results);