Restore virtual keyboard after switch back to FULL_WIDTH mode

ui/keyboard/keyboard_controller.cc

Index: ui/keyboard/keyboard_controller.cc
diff --git a/ui/keyboard/keyboard_controller.cc b/ui/keyboard/keyboard_controller.cc
index b34d42756339cea462020550b63038bc0bd8c947..a085c533a2d376cf50ec8b2d1f821aff77c33450 100644
--- a/ui/keyboard/keyboard_controller.cc
+++ b/ui/keyboard/keyboard_controller.cc
@@ -343,8 +343,16 @@ void KeyboardController::SetKeyboardMode(KeyboardMode mode) {
   if (keyboard_mode_ == FLOATING) {
     NotifyKeyboardBoundsChanging(gfx::Rect());
   } else if (keyboard_mode_ == FULL_WIDTH) {
-    // TODO(bshe): handle switch to FULL_WIDTH from FLOATING mode. We need a way
-    // to know the height of virtual keyboard in FULL_WIDTH mode before here.
+    // TODO(bshe): revisit this logic after we decide to support resize virtual
+    // keyboard.
+    int keyboard_height = GetContainerWindow()->bounds().height();
+    const gfx::Rect& root_bounds = container_->GetRootWindow()->bounds();
+    gfx::Rect new_bounds = root_bounds;
+    new_bounds.set_y(root_bounds.height() - keyboard_height);
+    new_bounds.set_height(keyboard_height);
+    GetContainerWindow()->SetBounds(new_bounds);
+    // No animation added, so call ShowAnimationFinished immediately.
+    ShowAnimationFinished();
   }
 }