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This CL adjusts layout to match the spec, adds ink drop to action
buttons, and adds a drop down icon next to title label.

Bug: 1133026
Change-Id: I46a8af315c98b43e2b557908dfebf810c1666ef0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436419Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811905}