Add virtualKeyboardPrivate.onKeyboardClosed API.

chrome/browser/ui/ash/chrome_keyboard_ui.cc

Index: chrome/browser/ui/ash/chrome_keyboard_ui.cc
diff --git a/chrome/browser/ui/ash/chrome_keyboard_ui.cc b/chrome/browser/ui/ash/chrome_keyboard_ui.cc
index 1128f6ae93c9cc5ca2ebbdbd89e3a4e859ce571d..062a6c20f8d66c9ccccd1c68acf9aa63b7f09c03 100644
--- a/chrome/browser/ui/ash/chrome_keyboard_ui.cc
+++ b/chrome/browser/ui/ash/chrome_keyboard_ui.cc
@@ -105,6 +105,23 @@ class AshKeyboardControllerObserver
     router->BroadcastEvent(std::move(event));
   }
 
+  void OnKeyboardDestroyed() override {
+    extensions::EventRouter* router = extensions::EventRouter::Get(context_);
+
+    if (!router->HasEventListener(
+            virtual_keyboard_private::OnKeyboardDestroyed::kEventName)) {
+      return;
+    }
+
+    std::unique_ptr<base::ListValue> args(new base::ListValue());
+    std::unique_ptr<extensions::Event> event(new extensions::Event(
+        extensions::events::VIRTUAL_KEYBOARD_PRIVATE_ON_KEYBOARD_DESTROYED,
+        virtual_keyboard_private::OnKeyboardDestroyed::kEventName,
+        std::move(args)));

[sky, 2016/07/06 16:03:00]

nit: std::move(args)->base::WrapUnique(new base::ListValue())).

[Azure Wei, 2016/07/08 06:35:24]

Done.

+    event->restrict_to_browser_context = context_;
+    router->BroadcastEvent(std::move(event));
+  }
+
  private:
   content::BrowserContext* context_;