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

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index c0a555f40681e5d46a5b04c2d86df0c626e18f93..9bc0e8fc123005183826374c80b14f18a616cd5e 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <string>
 
+#include "ash/accelerators/focus_manager_factory.h"
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/desktop_background/desktop_background_resources.h"
@@ -76,6 +77,7 @@
 #include "ui/gfx/screen.h"
 #include "ui/gfx/size.h"
 #include "ui/ui_controls/ui_controls.h"
+#include "ui/views/focus/focus_manager_factory.h"
 #include "ui/views/widget/native_widget_aura.h"
 #include "ui/views/widget/widget.h"
 
@@ -545,6 +547,8 @@ Shell::Shell(ShellDelegate* delegate)
 }
 
 Shell::~Shell() {
+  views::FocusManagerFactory::Install(NULL);
+
   RemoveRootWindowEventFilter(key_rewriter_filter_.get());
   RemoveRootWindowEventFilter(partial_screenshot_filter_.get());
   RemoveRootWindowEventFilter(input_method_filter_.get());
@@ -744,6 +748,8 @@ void Shell::Init() {
   window_cycle_controller_.reset(new WindowCycleController);
   monitor_controller_.reset(new internal::MonitorController);
   screen_dimmer_.reset(new internal::ScreenDimmer);
+
+  views::FocusManagerFactory::Install(new AshFocusManagerFactory);
 }
 
 aura::Window* Shell::GetContainer(int container_id) {