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This CL adds the paper plane icon as the reply button.
The icon is placed to the right of the text field in the inline reply.

In this CL, the name of NotificationInputMD is changed to NotificationInputTextfieldMD,
and another container view, NotificationInputMD is added
on top of NotificationInputTextfieldMD and NotificationInputReplyButtonMD.

This CL does not include the following features.
- Change the icon color when the textfield is clicked
- Send message when the icon is clicked

Bug: 803759
Change-Id: I20fe6455a8f3184d188d93892b1fc7c03764b1f4
Reviewed-on: https://chromium-review.googlesource.com/876182Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Megumi Hattori <megumihattori@google.com>
Cr-Commit-Position: refs/heads/master@{#531836}