Add power-user keyboard mode for ChromeOS with Search key acting as a typical Fn key.

ash/test/test_shell_delegate.h

Index: ash/test/test_shell_delegate.h
diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index b8f3ead91a5fe18392658ff1e937ca1f329453aa..c070a9b1007650e265a4bf7b94a96efdb9b3aee1 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -59,8 +59,12 @@ class TestShellDelegate : public ShellDelegate {
   virtual double GetSavedScreenMagnifierScale() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(aura::RootWindow* root) OVERRIDE;
   virtual aura::client::StackingClient* CreateStackingClient() OVERRIDE;
+  virtual bool IsSearchKeyActingAsFunctionKey() const OVERRIDE;
 
   int num_exit_requests() const { return num_exit_requests_; }
+  void set_is_search_key_acting_as_function_key(bool b) {
+    is_search_key_acting_as_function_key_ = b;
+  }
  private:
   friend class ash::test::AshTestBase;
 
@@ -87,6 +91,7 @@ class TestShellDelegate : public ShellDelegate {
   bool spoken_feedback_enabled_;
   bool user_logged_in_;
   bool can_lock_screen_;
+  bool is_search_key_acting_as_function_key_;
   int num_exit_requests_;
 
   scoped_ptr<content::BrowserContext> current_browser_context_;