Implements onBoundsChanged event in virtualKeyboardPrivate namespace

ui/keyboard/keyboard_controller_proxy.cc

Index: ui/keyboard/keyboard_controller_proxy.cc
diff --git a/ui/keyboard/keyboard_controller_proxy.cc b/ui/keyboard/keyboard_controller_proxy.cc
index 998213816f3c10e68c3c4e6721f35b71c6dadac5..be88620eb148243ecaddace2d18af660671f7cda 100644
--- a/ui/keyboard/keyboard_controller_proxy.cc
+++ b/ui/keyboard/keyboard_controller_proxy.cc
@@ -198,6 +198,10 @@ void KeyboardControllerProxy::ReloadKeyboardIfNeeded() {
   }
 }
 
+void KeyboardControllerProxy::SetController(KeyboardController* controller) {
+  keyboard_controller_ = controller;
+}
+
 void KeyboardControllerProxy::SetupWebContents(content::WebContents* contents) {
 }