first cut at uber page

content/browser/webui/web_ui.h

Index: content/browser/webui/web_ui.h
diff --git a/content/browser/webui/web_ui.h b/content/browser/webui/web_ui.h
index 5cba59f159833195a5407c7f92c9661ca1604b46..449515772c2fe86ea7273ead2cec2b2906816496 100644
--- a/content/browser/webui/web_ui.h
+++ b/content/browser/webui/web_ui.h
@@ -118,28 +118,32 @@ class CONTENT_EXPORT WebUI : public IPC::Channel::Listener {
     register_callback_overwrites_ = value;
   }
 
+  void set_frame_xpath(const std::string& xpath) {
+    frame_xpath_ = xpath;
+  }
+
   // Call a Javascript function by sending its name and arguments down to
   // the renderer.  This is asynchronous; there's no way to get the result
   // of the call, and should be thought of more like sending a message to
   // the page.
   // All function names in WebUI must consist of only ASCII characters.
   // There are variants for calls with more arguments.
-  void CallJavascriptFunction(const std::string& function_name);
-  void CallJavascriptFunction(const std::string& function_name,
+  virtual void CallJavascriptFunction(const std::string& function_name);
+  virtual void CallJavascriptFunction(const std::string& function_name,
                               const base::Value& arg);
-  void CallJavascriptFunction(const std::string& function_name,
+  virtual void CallJavascriptFunction(const std::string& function_name,
                               const base::Value& arg1,
                               const base::Value& arg2);
-  void CallJavascriptFunction(const std::string& function_name,
+  virtual void CallJavascriptFunction(const std::string& function_name,
                               const base::Value& arg1,
                               const base::Value& arg2,
                               const base::Value& arg3);
-  void CallJavascriptFunction(const std::string& function_name,
+  virtual void CallJavascriptFunction(const std::string& function_name,
                               const base::Value& arg1,
                               const base::Value& arg2,
                               const base::Value& arg3,
                               const base::Value& arg4);
-  void CallJavascriptFunction(const std::string& function_name,
+  virtual void CallJavascriptFunction(const std::string& function_name,
                               const std::vector<const base::Value*>& args);
 
   TabContents* tab_contents() const { return tab_contents_; }
@@ -190,6 +194,10 @@ class CONTENT_EXPORT WebUI : public IPC::Channel::Listener {
   typedef std::map<std::string, MessageCallback> MessageCallbackMap;
   MessageCallbackMap message_callbacks_;
 
+  // The path for the iframe this WebUI is embedded in (empty if not in an
+  // iframe).
+  std::string frame_xpath_;
+
   DISALLOW_COPY_AND_ASSIGN(WebUI);
 };