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Previously, only web notifications have the inline settings and can be
blocked depending the settings. This CL also applies this feature to
Chrome extension notifications.

This CL adds the inline settings on the Chrome extension notification
and enables users to choose whether to block the notification or not.

Due to this implementation, a gear icon for the inline settings is
also added on the notification.

BUG=810622

Change-Id: I6197167d2c587cd40a1e92b81a5bba5d3057820f
Reviewed-on: https://chromium-review.googlesource.com/923877
Commit-Queue: Megumi Hattori <megumihattori@google.com>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539067}