Add an initial implementation of the downloads MD settings page.

chrome/browser/resources/settings/downloads_page/downloads_page.css

Index: chrome/browser/resources/settings/downloads_page/downloads_page.css
diff --git a/chrome/browser/resources/settings/downloads_page/downloads_page.css b/chrome/browser/resources/settings/downloads_page/downloads_page.css
new file mode 100644
index 0000000000000000000000000000000000000000..2977dc0c232c62adb5856329ecc1dc72755672ee
--- /dev/null
+++ b/chrome/browser/resources/settings/downloads_page/downloads_page.css
@@ -0,0 +1,25 @@
+/* Copyright 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. */
+
+core-label {
+  margin: 10px;
+}
+
+cr-checkbox {
+  -webkit-margin-end: 10px;
+}
+
+cr-input {
+  width: 300px;
+}
+
+cr-input::shadow #input {
+  /* This ensures that the "Download location" label and the text in the input
+   * itself are vertically aligned. */
+  margin: 0.25em 0;
+}
+
+.location-label {
+  -webkit-margin-end: 10px;
+}