linux: only create browser-side plugin container after plugin requests it

webkit/glue/webplugin.h

Index: webkit/glue/webplugin.h
diff --git a/webkit/glue/webplugin.h b/webkit/glue/webplugin.h
index 2debf9aa52d1b2e376c78bf2045dd4e4c7350afb..07d2470cd2c689fa6f12cd5dd66844ba363d6dce 100644
--- a/webkit/glue/webplugin.h
+++ b/webkit/glue/webplugin.h
@@ -52,6 +52,13 @@ class WebPlugin {
   WebPlugin() { }
   virtual ~WebPlugin() { }
 
+#if defined(OS_LINUX)
+  // Called by the plugin delegate to request a container for a new
+  // windowed plugin.  This handle will later get destroyed with
+  // WillDestroyWindow.
+  virtual gfx::PluginWindowHandle CreatePluginContainer() = 0;
+#endif
+
   // Called by the plugin delegate to let the WebPlugin know if the plugin is
   // windowed (i.e. handle is not NULL) or windowless (handle is NULL).  This
   // tells the WebPlugin to send mouse/keyboard events to the plugin delegate,