Implement virtual keyboard hiding.

ui/keyboard/keyboard_ui_handler.cc

Index: ui/keyboard/keyboard_ui_handler.cc
diff --git a/ui/keyboard/keyboard_ui_handler.cc b/ui/keyboard/keyboard_ui_handler.cc
index 0c412675d3e8d1b8fd12231f6335d858db5945a3..7771a97ce29313d7856e45ea97430a1dca4e4114 100644
--- a/ui/keyboard/keyboard_ui_handler.cc
+++ b/ui/keyboard/keyboard_ui_handler.cc
@@ -13,6 +13,7 @@
 #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 {
@@ -28,6 +29,10 @@ void KeyboardUIHandler::RegisterMessages() {
       "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) {
@@ -48,4 +53,10 @@ void KeyboardUIHandler::HandleInsertTextMessage(const base::ListValue* args) {
     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