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

webkit/plugins/ppapi/ppapi_plugin_instance.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_PLUGINS_PPAPI_PPAPI_PLUGIN_INSTANCE_H_
 #define WEBKIT_PLUGINS_PPAPI_PPAPI_PLUGIN_INSTANCE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 343 matching lines @@
   // NULL until we have been initialized.
   WebKit::WebPluginContainer* container_;
 
   // Plugin URL.
   GURL plugin_url_;
 
   // Indicates whether this is a full frame instance, which means it represents
   // 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.
   gfx::Rect position_;
 
   // Current clip rect. This will be empty if the plugin is not currently
   // visible. This is in the plugin's coordinate system, so fully visible will
   // be (0, 0, w, h) regardless of scroll position.
   gfx::Rect clip_;
 
@@ skipping 116 matching lines @@
   uint32_t input_event_mask_;
   uint32_t filtered_input_event_mask_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInstance);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPAPI_PLUGIN_INSTANCE_H_