Implement initial chrome.browserAction.openPopup API.

chrome/browser/extensions/extension_toolbar_model.h

Index: chrome/browser/extensions/extension_toolbar_model.h
diff --git a/chrome/browser/extensions/extension_toolbar_model.h b/chrome/browser/extensions/extension_toolbar_model.h
index df01de5d17281de69b7072048f8efca77b573e26..403c581b014c0a04477772951b5a01607754fc93 100644
--- a/chrome/browser/extensions/extension_toolbar_model.h
+++ b/chrome/browser/extensions/extension_toolbar_model.h
@@ -48,6 +48,10 @@ class ExtensionToolbarModel : public content::NotificationObserver {
     virtual void BrowserActionMoved(const extensions::Extension* extension,
                                     int index) {}
 
+    // The browser action should show the popup now.

[Finnur, 2013/10/15 10:44:21]

nit: The browser action for |extension| should...

[justinlin, 2013/10/16 07:06:48]

Done.

+    virtual void BrowserActionShowPopup(
+        const extensions::Extension* extension) {}
+
     // Called when the model has finished loading.
     virtual void ModelLoaded() {}
 
@@ -59,6 +63,7 @@ class ExtensionToolbarModel : public content::NotificationObserver {
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
   void MoveBrowserAction(const extensions::Extension* extension, int index);
+  void ShowBrowserActionPopup(const extensions::Extension* extension);
   // Executes the browser action for an extension and returns the action that
   // the UI should perform in response.
   // |popup_url_out| will be set if the extension should show a popup, with
@@ -66,6 +71,9 @@ class ExtensionToolbarModel : public content::NotificationObserver {
   Action ExecuteBrowserAction(const extensions::Extension* extension,
                               Browser* browser,
                               GURL* popup_url_out);
+  // Retrieves the URL that should be loaded in the popup for an extension
+  // without granting host permissions for the tab. Used for the showPopup API.
+  GURL GetPopupUrl(const extensions::Extension* extension, Browser* browser);
   // If count == size(), this will set the visible icon count to -1, meaning
   // "show all actions".
   void SetVisibleIconCount(int count);