Do not activate TrayBubbleView by default

ash/system/web_notification/web_notification_tray.cc

Index: ash/system/web_notification/web_notification_tray.cc
diff --git a/ash/system/web_notification/web_notification_tray.cc b/ash/system/web_notification/web_notification_tray.cc
index 9154a43ca60aade4be5f9aa52e4788dd49d3c496..1bbbef3dab347c72f0ded9fb151daee44b357b81 100644
--- a/ash/system/web_notification/web_notification_tray.cc
+++ b/ash/system/web_notification/web_notification_tray.cc
@@ -4,6 +4,8 @@
 
 #include "ash/system/web_notification/web_notification_tray.h"
 
+#include "ash/accelerators/accelerator_controller.h"
+#include "ash/accessibility_delegate.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "ash/root_window_controller.h"
 #include "ash/session/session_controller.h"
@@ -428,6 +430,10 @@ base::string16 WebNotificationTray::GetAccessibleNameForTray() {
   return l10n_util::GetStringUTF16(IDS_MESSAGE_CENTER_ACCESSIBLE_NAME);
 }
 
+bool WebNotificationTray::ShouldEnableExtraKeyboardAccessibility() {

[James Cook, 2017/06/09 16:06:13]

nit: functions in .cc should match order in header

[yawano, 2017/06/12 09:11:03]

Done.

+  return Shell::Get()->accessibility_delegate()->IsSpokenFeedbackEnabled();
+}
+
 void WebNotificationTray::HideBubbleWithView(
     const views::TrayBubbleView* bubble_view) {
   if (message_center_bubble() &&
@@ -455,6 +461,18 @@ void WebNotificationTray::OnMouseEnteredView() {}
 
 void WebNotificationTray::OnMouseExitedView() {}
 
+void WebNotificationTray::RegisterAccelerators(
+    const std::vector<ui::Accelerator>& accelerators,
+    views::TrayBubbleView* tray_bubble_view) {
+  Shell::Get()->accelerator_controller()->Register(accelerators,
+                                                   tray_bubble_view);
+}
+
+void WebNotificationTray::UnregisterAllAccelerators(
+    views::TrayBubbleView* tray_bubble_view) {
+  Shell::Get()->accelerator_controller()->UnregisterAll(tray_bubble_view);
+}
+
 base::string16 WebNotificationTray::GetAccessibleNameForBubble() {
   return GetAccessibleNameForTray();
 }