Add hideKeyboard API to chrome.experimental.input.

chrome/browser/extensions/extension_input_ui_api.cc

Index: chrome/browser/extensions/extension_input_ui_api.cc
diff --git a/chrome/browser/extensions/extension_input_ui_api.cc b/chrome/browser/extensions/extension_input_ui_api.cc
index 0aae4b50d3571610fad727eebdb0f519877531fd..ba83fa4d5845778c6e8827a4e58275638953b72c 100644
--- a/chrome/browser/extensions/extension_input_ui_api.cc
+++ b/chrome/browser/extensions/extension_input_ui_api.cc
@@ -4,6 +4,9 @@
 
 #include "chrome/browser/extensions/extension_input_ui_api.h"
 
+#include "content/common/notification_service.h"
+
+#if defined(OS_CHROMEOS)
 #include <algorithm>
 #include <string>
 
@@ -358,3 +361,12 @@ bool PageDownInputUiFunction::RunImpl() {
   return true;
 }
 
+#endif  // OS_CHROMEOS
+
+bool HideKeyboardInputUiFunction::RunImpl() {
+  NotificationService::current()->Notify(
+      NotificationType::HIDE_KEYBOARD_INVOKED,
+      Source<HideKeyboardInputUiFunction>(this),
+      NotificationService::NoDetails());
+  return true;
+}