Implementation of the Extension Activity Log UI behind a flag.

chrome/browser/resources/extensions/extension_activity.css

Index: chrome/browser/resources/extensions/extension_activity.css
diff --git a/chrome/browser/resources/extensions/extension_activity.css b/chrome/browser/resources/extensions/extension_activity.css
new file mode 100644
index 0000000000000000000000000000000000000000..54ab2f0f6c78b0357563e8e65454e01014f2410c
--- /dev/null
+++ b/chrome/browser/resources/extensions/extension_activity.css
@@ -0,0 +1,16 @@
+/* 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. */
+
+body {
+  -webkit-padding-start: 0.67em;
+}
+
+#extension-activity-list {
+  -webkit-padding-before: 0.67em;
+}
+
+.extension-activity-time,
+.extension-activity-label {
+  -webkit-padding-end: 10px;
+}