Identity API: Add component app for auth flow UI

chrome/browser/resources/identity_scope_approval_dialog/scope_approval_dialog.css

Index: chrome/browser/resources/identity_scope_approval_dialog/scope_approval_dialog.css
diff --git a/chrome/browser/resources/identity_scope_approval_dialog/scope_approval_dialog.css b/chrome/browser/resources/identity_scope_approval_dialog/scope_approval_dialog.css
new file mode 100644
index 0000000000000000000000000000000000000000..cf30fae746a324a00c3a03d9702c47481d7440b9
--- /dev/null
+++ b/chrome/browser/resources/identity_scope_approval_dialog/scope_approval_dialog.css
@@ -0,0 +1,31 @@
+/* Copyright (c) 2013 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. */
+
+body {
+  margin: 0;
+  padding: 0;
+}
+
+.titlebar {
+  -webkit-app-region: drag;
+  background-color: white;
+  border-bottom: 1px solid #e5e5e5;
+  height: 26px;
+  white-space: nowrap;
+  width: 100%;
+}
+
+.titlebar-close-button {
+  -webkit-app-region: no-drag;
+  height: 14px;
+  margin: 6px;
+  position: absolute;
+  right: 0;
+  width: 14px;
+}
+
+.content {
+  height: auto;
+  width: 100%;
+}