Add native permissions dialog for apps_devtools app.

chrome/browser/extensions/extension_install_prompt.h

Index: chrome/browser/extensions/extension_install_prompt.h
diff --git a/chrome/browser/extensions/extension_install_prompt.h b/chrome/browser/extensions/extension_install_prompt.h
index 55c32c6c94e883958b777b65657b82021f714e64..c80a11315a6fb6867d86537d0051c82d2b0f58a3 100644
--- a/chrome/browser/extensions/extension_install_prompt.h
+++ b/chrome/browser/extensions/extension_install_prompt.h
@@ -294,6 +294,9 @@ class ExtensionInstallPrompt
   virtual void ReviewPermissions(Delegate* delegate,
                                  const extensions::Extension* extension);
 
+  virtual void PermissionsDialog(Delegate* delegate,

[asargent_no_longer_on_chrome, 2013/03/27 19:27:04]

nit: Please add a brief comment about what this does, if/how the Delegate can
expect to be called back, etc. Also, the ReviewPermissions function just above
this sounds pretty similar, so it might be helpful to mention the difference
between the two. 

Finally, a better name might include a verb, like "ShowPermissionsDialog" or
maybe "ConfirmPermissions" (to match the form of the Confirm* methods above)?

+                                 const extensions::Extension* extension);
+
   // Installation was successful. This is declared virtual for testing.
   virtual void OnInstallSuccess(const extensions::Extension* extension,
                                 SkBitmap* icon);
@@ -311,6 +314,7 @@ class ExtensionInstallPrompt
 
  private:
   friend class GalleryInstallApiTestObserver;
+  friend class ExtensionPermissionsPrompt;
 
   // Sets the icon that will be used in any UI. If |icon| is NULL, or contains
   // an empty bitmap, then a default icon will be used instead.