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

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 0f81bde0d57022027198a6cf42f86cca6496aa31..e679c5dfceefb6d0663f0b365e0b5cb2937e1329 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -24,6 +24,7 @@ TestShellDelegate::TestShellDelegate()
       spoken_feedback_enabled_(false),
       user_logged_in_(true),
       can_lock_screen_(true),
+      is_search_key_acting_as_function_key_(false),
       num_exit_requests_(0) {
 }
 
@@ -171,6 +172,10 @@ aura::client::StackingClient* TestShellDelegate::CreateStackingClient() {
   return new StackingController;
 }
 
+bool TestShellDelegate::IsSearchKeyActingAsFunctionKey() const {
+  return is_search_key_acting_as_function_key_;
+}
+
 void TestShellDelegate::SetSessionStarted(bool session_started) {
   session_started_ = session_started;
   if (session_started)