Implement virtual keyboard hiding.

ui/keyboard/keyboard_ui_handler.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/keyboard/keyboard_ui_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/public/browser/web_ui.h"
 #include "ui/aura/window.h"
+#include "ui/keyboard/keyboard_controller.h"
 #include "ui/keyboard/keyboard_util.h"
 
 namespace keyboard {
 
 KeyboardUIHandler::KeyboardUIHandler() {
 }
 
 KeyboardUIHandler::~KeyboardUIHandler() {
 }
 
 void KeyboardUIHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(
       "insertText",
       base::Bind(&KeyboardUIHandler::HandleInsertTextMessage,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      "hideKeyboard",
+      base::Bind(&KeyboardUIHandler::HandleHideKeyboard,
+                 base::Unretained(this)));
 }
 
 void KeyboardUIHandler::HandleInsertTextMessage(const base::ListValue* args) {
   string16 text;
   if (!args->GetString(0, &text)) {
     LOG(ERROR) << "insertText failed: bad argument";
     return;
   }
 
   aura::RootWindow* root_window =
       web_ui()->GetWebContents()->GetView()->GetNativeView()->GetRootWindow();
   if (!root_window) {
     LOG(ERROR) << "insertText failed: no root window";
     return;
   }
 
   if (!keyboard::InsertText(text, root_window))
     LOG(ERROR) << "insertText failed";
 }
 
+void KeyboardUIHandler::HandleHideKeyboard(const base::ListValue* args) {
+  // TODO(stevet): Call into the keyboard controller to hide the keyboard
+  // directly.

[SteveT, 2013/07/31 03:19:18]

Looks like I encountered the same problem as you, here. I may leave this as a
TODO and unimplemented for now (since WebUI doesn't support a hide-keyboard key
yet).

+  return;
+}
+
 }  // namespace keyboard