Let Chrome app handle Ash accelerators first if the app is launched as a window

ash/shell_delegate.h

Index: ash/shell_delegate.h
diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index 0a86aa33f48183d3a2724d3ecf96af693e23dc08..3e7aca893736d313f777ffc867261df6ff58b5b8 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -59,6 +59,9 @@ class ASH_EXPORT ShellDelegate {
   // Invoked when the user uses Ctrl-N or Ctrl-Shift-N to open a new window.
   virtual void NewWindow(bool incognito) = 0;
 
+  // Returns true if |window| is one of the browser windows.
+  virtual bool IsBrowserWindow(const aura::Window* window) = 0;

[Ben Goodger (Google), 2012/05/01 16:00:37]

IsWebContentsView()

[Yusuke Sato, 2012/05/02 16:40:11]

I've added code directly to accelerator_filter.cc which checks if an
aura::Window is for a Web contents view. Please let me keep the interface as-is
since I also need a way to know whether the |window| is a non-App browser window
or not.

[Ben Goodger (Google), 2012/05/03 17:29:38]

Why do you need to know if it is a browser window?

[Yusuke Sato, 2012/05/03 17:45:59]

This is because when it is a (non-app) browser window, an Ash accelerator such
as Ctrl+N and F6-F10 has to be processed in Ash before the accelerator is passed
to the browser.

+
   // Invoked when the user presses the Search key.
   virtual void Search() = 0;