Add a way to fetch window frame metrics from NativeShellWindow

chrome/browser/ui/gtk/extensions/native_app_window_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/extensions/native_app_window_gtk.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/gtk/extensions/extension_keybinding_registry_gtk.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
@@ skipping 209 matching lines @@
 }
 
 void NativeAppWindowGtk::FlashFrame(bool flash) {
   gtk_window_set_urgency_hint(window_, flash);
 }
 
 bool NativeAppWindowGtk::IsAlwaysOnTop() const {
   return false;
 }
 
+gfx::Insets NativeAppWindowGtk::GetFrameInsets() const {
+  return gfx::Insets();
+}
+
 void NativeAppWindowGtk::ActiveWindowChanged(GdkWindow* active_window) {
   // Do nothing if we're in the process of closing the browser window.
   if (!window_)
     return;
 
   is_active_ = gtk_widget_get_window(GTK_WIDGET(window_)) == active_window;
 }
 
 // Callback for the delete event.  This event is fired when the user tries to
 // close the window (e.g., clicking on the X in the window manager title bar).
@@ skipping 122 matching lines @@
 
   draggable_region_.reset(ShellWindow::RawDraggableRegionsToSkRegion(regions));
 }
 
 // static
 NativeAppWindow* NativeAppWindow::Create(
     ShellWindow* shell_window,
     const ShellWindow::CreateParams& params) {
   return new NativeAppWindowGtk(shell_window, params);
 }