Some improvement of validation message bubble UI.

chrome/browser/ui/gtk/bubble/bubble_gtk.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/gtk/bubble/bubble_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include "base/i18n/rtl.h"
 #include "chrome/browser/ui/gtk/bubble/bubble_accelerators_gtk.h"
@@ skipping 539 matching lines @@
 }
 
 void BubbleGtk::Close() {
   // We don't need to ungrab the pointer or keyboard here; the X server will
   // automatically do that when we destroy our window.
   DCHECK(window_);
   gtk_widget_destroy(window_);
   // |this| has been deleted, see OnDestroy.
 }
 
+void BubbleGtk::SetPositionRelativeToAnchor(const gfx::Rect* rect) {
+  rect_ = rect ? *rect : gtk_util::WidgetBounds(anchor_widget_);
+  if (!UpdateFrameStyle(false))
+    MoveWindow();
+}
+
 void BubbleGtk::GrabPointerAndKeyboard() {
   GdkWindow* gdk_window = gtk_widget_get_window(window_);
 
   // Install X pointer and keyboard grabs to make sure that we have the focus
   // and get all mouse and keyboard events until we're closed. As a hack, grab
   // the pointer even if |grab_input_| is false to prevent a weird error
   // rendering the bubble's frame. See
   // https://code.google.com/p/chromium/issues/detail?id=130820.
   GdkGrabStatus pointer_grab_status =
       gdk_pointer_grab(gdk_window,
@@ skipping 201 matching lines @@
   anchor_widget_ = NULL;
   Close();
   // |this| is deleted.
 }
 
 void BubbleGtk::OnToplevelDestroy(GtkWidget* widget) {
   toplevel_window_ = NULL;
   Close();
   // |this| is deleted.
 }