Fix a couple of scroll-related issues:

remoting/webapp/main.css

 /* 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.
  */
 
 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p,
 blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em,
 font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl,
 dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody,
 tfoot, thead, tr, th, td, button {
@@ skipping 601 matching lines @@
 #daemon-plugin-container {
   width: 0;
   height: 0;
 }
 
 .dialog-container {
   position: absolute;
   top: 200px;
   left: 0;
   width: 100%;
+  z-index: 2;
 }
 
 .dialog-screen {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   background-color: #fff;
   opacity: 0.75;
+  z-index: 1;
+}
+
+/* For apps v2, don't cover the 1px window border. */
+html.apps-v2 .dialog-screen {
+  width: calc(100% - 2px);
+  height: calc(100% - 2px);
+  top: 1px;
+  left: 1px;
 }
 
 /* TODO(jamiewalch): crbug.com/252796: Remove these once crbug.com/240772
  * is fixed. */
 .no-horizontal-scroll {
   overflow-x: hidden !important;
 }
 
 .no-vertical-scroll {
   overflow-y: hidden !important;
@@ skipping 98 matching lines @@
  * no scroll-bars, so the advantages of flex-box layout to achieve centering
  * (ie, the DOM is easier to measure to determine when scroll-bars are needed)
  * don't apply */
 .full-screen #session-mode {
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
 }
 
+/* Override full-height class until connected, otherwise it takes up 100% of
+ * the window height in addition to the home-screen UI. */
+body:not(.connected) #session-mode {
+  height: auto;
+}
+
 /* video-container needs relative position so that mediasource-video-output can
  * be positioned relative to the parent with position:absolute. */
 #video-container {
   position: relative;
 }
 
 /* mediasource-video-output is hidden by default. */
 #video-container video {
   display: none;
 }
@@ skipping 20 matching lines @@
 }
 
 .mouse-cursor-overlay {
   position: absolute;
   pointer-events: none;
 }
 
 body.hangout-remote-desktop .home-screen {
   display: none;
 }