Don't send DidChangeView to the plugin unless the parameters have actually changed.

webkit/plugins/ppapi/ppapi_plugin_instance.h

Index: webkit/plugins/ppapi/ppapi_plugin_instance.h
===================================================================
--- webkit/plugins/ppapi/ppapi_plugin_instance.h	(revision 98432)
+++ webkit/plugins/ppapi/ppapi_plugin_instance.h	(working copy)
@@ -361,6 +361,11 @@
   // an entire document rather than an embed tag.
   bool full_frame_;
 
+  // Indicates if we've ever sent a didChangeView to the plugin. This ensure we
+  // always send an initial notification, even if the position and clip are the
+  // same as the default values.
+  bool sent_did_change_view_;
+
   // Position in the viewport (which moves as the page is scrolled) of this
   // plugin. This will be a 0-sized rectangle if the plugin has not yet been
   // laid out.