Add setBounds method and browsertest for get/set bounds to app window API

chrome/common/extensions/api/app_window.idl

 // 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.
 
 namespace app.window {
   dictionary CreateWindowOptions {
     // Id to identify the window. This will be used to remember the size
     // and position of the window and restore that geometry when a window
     // with the same id (and no explicit size or position) is later opened.
     DOMString? id;
@@ skipping 82 matching lines @@
 
     // Close the window.
     static void close();
 
     // Show the window. Does nothing if the window is already visible.
     static void show();
 
     // Hide the window. Does nothing if the window is already hidden.
     static void hide();
 
+    // Set the window's bounds.
+    static void setBounds(Bounds bounds);
+
     // The JavaScript 'window' object for the created child.
     [instanceOf=global] object contentWindow;
   };
 
   interface Functions {
     // The size and position of a window can be specified in a number of
     // different ways. The most simple option is not specifying anything at
     // all, in which case a default size and platform dependent position will
     // be used.
     //
@@ skipping 22 matching lines @@
                        optional CreateWindowCallback callback);
 
     // Returns an <a href="#type-AppWindow">AppWindow</a> object for the
     // current script context (ie JavaScript 'window' object). This can also be
     // called on a handle to a script context for another page, for example:
     // otherWindow.chrome.app.window.current().
     [nocompile] static AppWindow current();
     [nocompile, nodoc] static void initializeAppWindow(object state);
   };
 };