[Aura] Initial app list webui.

chrome/browser/resources/aura/app_list/app_list.css

+/*
+ * Copyright (c) 2011 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 {
+  -webkit-user-select: none;
+  height: 100%;
+  margin: 0;
+  overflow: hidden;
+  padding: 0;
+}
+
+.tile-page-content {
+  padding: 0;
+}
+
+.app-contents > span {
+  color: white;
+  font-size: 14px;
+  font-weight: bold;
+  text-shadow: 0 0 2px black, 0 0 4px black;
+}
+
+#launcher-search-container {
+  position: relative;
+  z-index: 5;
+}
+
+#launcher-search,
+#launcher-search::-webkit-input-placeholder {
+  color: white;
+}
+
+#launcher-search {
+  -webkit-padding-start: 10px;
+  -webkit-box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.1);
+  background-color: rgba(0, 0, 0, 0.2);
+  border: none;
+  font-size: 14px;
+  height: 34px;
+  min-width: 384px;
+  outline: 1px solid rgba(0, 0, 0, 0.1);
+}
+
+#card-slider-frame {
+  /* Must match #footer height. 0 because footer is hidden.*/
+  bottom: 0;
+  overflow: hidden;
+  /* We want this to fill the window except for the region used
+     by footer */
+  position: fixed;
+  top: 0;
+  width: 100%;
+}
+
+#page-list {
+  /* fill the apps-frame */
+  height: 100%;
+  display: -webkit-box;
+}
+
+#footer {
+  background-image: -webkit-linear-gradient(
+      rgba(242, 242, 242, 0.9), rgba(222, 222, 222, 0.9));
+  bottom: 0;
+  position: fixed;
+  width: 100%;
+  z-index: 5;
+}
+
+#footer-content {
+  -webkit-box-align: center;
+  display: -webkit-box;
+  height: 49px;
+}