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 c45704e4fb6b4dc89b27d8dd986f5b681a421105..798061f483a2827449048c144efdfc1285f5e539 100644
--- a/webkit/plugins/ppapi/plugin_delegate.h
+++ b/webkit/plugins/ppapi/plugin_delegate.h
@@ -493,7 +493,7 @@ class PluginDelegate {
   // 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).

[yzshen1, 2012/01/04 00:50:00]

Please remember to change the comment about when/whether OnLockMouseACK() will
be called.

-  virtual void LockMouse(PluginInstance* instance) = 0;
+  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