Reland of DevTools: automatically populate 'More tools' submenu with the drawer views.

third_party/WebKit/Source/devtools/front_end/devices/devicesView.css

 /*
  * Copyright (c) 2015 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.
  */
 
 .devices-view {
     padding-top: 15px;
 }
 
@@ skipping 67 matching lines @@
     border-top: 1px solid #cdcdcd;
     background-color: #f3f3f3;
     flex: none;
     padding: 3px 10px;
 }
 
 .devices-footer > span {
     white-space: pre;
 }
 
+.discovery-view {
+    overflow: auto;
+}
+
+.discovery-view > * {
+    flex: none;
+}
+
 .usb-checkbox {
     padding-bottom: 8px;
     margin-top: 20px;
 }
 
 .port-forwarding-header {
     display: flex;
     align-items: center;
     flex-direction: row;
     margin-top: 5px;
 }
 
 .add-rule-button {
     margin: 10px 25px;
     align-self: flex-start;
 }
 
 .discovery-help {
     margin: 5px 0 25px 25px;
 }
 
 .discovery-help > span {
     white-space: pre;
 }
 
 .port-forwarding-list {
     margin: 10px 0 0 25px;
     max-width: 500px;
-    flex: 0 1 auto;
+    flex: none;
 }
 
 .port-forwarding-list-empty {
     flex: auto;
     height: 30px;
     display: flex;
     align-items: center;
     justify-content: center;
 }
 
@@ skipping 72 matching lines @@
 .device-serial {
     color: #777;
     margin-left: 5px;
     flex: none;
 }
 
 .device-browser-list {
     flex: auto;
     overflow: auto;
     padding-right: 10px;
-    margin-top: 20px;
+    margin-top: 30px;
 }
 
 .device-browser-list > div {
     margin-bottom: 15px;
 }
 
 .device-browser-title {
     font-size: 16px;
 }
 
@@ skipping 46 matching lines @@
     margin-left: 3px;
     padding: 0;
     border-radius: 3px;
 }
 
 .device-page-title-row .toolbar:hover {
     background-color: hsl(0, 0%, 90%);
 }
 
 .device-page-url {
-    margin: 3px 0;
+    margin: 3px 100px 3px 0;
 }
 
 .device-page-url a {
     color: #777;
     word-break: break-all;
 }
 
 .device-view-more {
     cursor: pointer;
     text-decoration: underline;
@@ skipping 35 matching lines @@
 }
 
 .device-view-port-icon.device-view-port-icon-error {
     background-color: red;
 }
 
 .device-view-port-icon.device-view-port-icon-transient {
     transform: scale(1.2);
     background-color: orange;
 }