Only allow to lock the mouse when the tab is in fullscreen mode.

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 9b6a14ca7dc632eb823ddbb3129ce4608f0f3c63..f6cb64cd4aac5231b8697eced470c350f7004e1f 100644
--- a/content/browser/renderer_host/render_widget_host.h
+++ b/content/browser/renderer_host/render_widget_host.h
@@ -468,6 +468,11 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   virtual void NotifyRendererUnresponsive() {}
   virtual void NotifyRendererResponsive() {}
 
+  // RenderViewhost overrides this method to check whether it is allowed to lock
+  // the mouse.
+  virtual bool HasMouseLockPermission() const;

[sky, 2011/09/28 22:58:04]

Add a real description. Also, what about CanLockMouse?

[yzshen1, 2011/09/29 20:41:04]

Done.

+
+  void UnlockMouseIfNecessary();
   bool IsMouseLocked() const;
 
  protected: