[Chromoting] Update size to use inner/outer bounds

BUG=

Review URL: https://codereview.chromium.org/654393005

Cr-Commit-Position: refs/heads/master@{#301388}

remoting/webapp/base/js/message_window.js

@@ -49,8 +49,13 @@ MessageWindowImpl.prototype.sendReply_ = function(
  * @private
  */
 MessageWindowImpl.prototype.updateSize_ = function() {
-  var borderY = window.outerHeight - window.innerHeight;
-  window.resizeTo(window.outerWidth, document.body.clientHeight + borderY);
+  var outerBounds = chrome.app.window.current().outerBounds;
+  var innerBounds = chrome.app.window.current().innerBounds;
+  var borderY = outerBounds.height - innerBounds.height;
+  window.resizeTo(outerBounds.width, document.body.clientHeight + borderY);
+  // Sometimes, resizing the window causes its position to be reset to (0, 0),
+  // so restore it explicitly.
+  window.moveTo(outerBounds.left, outerBounds.top);
 };
 
 /**

remoting/webapp/js_proto/chrome_proto.js

@@ -364,6 +364,10 @@ var AppWindow = function() {
   this.onFullscreened = null;
   /** @type {string} */
   this.id = '';
+  /** @type {Bounds} */
+  this.outerBounds = null;
+  /** @type {Bounds} */
+  this.innerBounds = null;
 };
 
 AppWindow.prototype.close = function() {};
@@ -399,6 +403,18 @@ var LaunchData = function() {
   this.items = [];
 };
 
+/** @constructor */
+function Bounds() {
+  /** @type {number} */
+  this.left = 0;
+  /** @type {number} */
+  this.top = 0;
+  /** @type {number} */
+  this.width = 0;
+  /** @type {number} */
+  this.height = 0;
+};
+
 /** @constructor */
 function ClientRect() {
   /** @type {number} */