refactoring mouse lock to support pepper and WebKit

webkit/plugins/ppapi/plugin_delegate.h

Index: webkit/plugins/ppapi/plugin_delegate.h
diff --git a/webkit/plugins/ppapi/plugin_delegate.h b/webkit/plugins/ppapi/plugin_delegate.h
index 6f9a17e8c896249253a3835caa77db7044e5f04e..d91621c8a5fc4d111c3c56f92361f25dbc9a8bfd 100644
--- a/webkit/plugins/ppapi/plugin_delegate.h
+++ b/webkit/plugins/ppapi/plugin_delegate.h
@@ -490,11 +490,11 @@ class PluginDelegate {
   // Returns the current preferences.
   virtual ::ppapi::Preferences GetPreferences() = 0;
 
-  // Locks the mouse for |instance|. It will call
-  // PluginInstance::OnLockMouseACK() to notify the instance when the operation
-  // is completed. The call to OnLockMouseACK() may be synchronous (i.e., it may
-  // be called when LockMouse() is still on the stack).
-  virtual void LockMouse(PluginInstance* instance) = 0;
+  // Locks the mouse for |instance|. If false is returned, the lock is not
+  // possible. If true is returned then the lock is pending. Success or
+  // failure will be delivered asynchronously via
+  // PluginInstance::OnLockMouseACK().
+  virtual bool LockMouse(PluginInstance* instance) = 0;
 
   // Unlocks the mouse if |instance| currently owns the mouse lock. Whenever an
   // plugin instance has lost the mouse lock, it will be notified by
@@ -504,6 +504,9 @@ class PluginDelegate {
   // call to the current mouse lock owner.
   virtual void UnlockMouse(PluginInstance* instance) = 0;
 
+  // Returns true iff |instance| currently owns the mouse lock.
+  virtual bool IsMouseLocked(PluginInstance* instance) = 0;
+
   // Notifies that |instance| has changed the cursor.
   // This will update the cursor appearance if it is currently over the plugin
   // instance.