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In the WebAPKs' dialog, there are 12dp padding between the title and the
content. Currently, these padding are added as the top padding of the
content, leaving no padding below the title. It looks fine on L+, but looks
tight on pre-L which has a blue line between the title and the content.
In this CL, we split the padding as 6dp above the blue line, and 6dp
under the blue line.

Before:
https://drive.google.com/open?id=0B7zEF5GgyYmpLU9SendyX00zZlk

After:
https://drive.google.com/open?id=0B7zEF5GgyYmpTEVBUnB6UXhaMDg

Bug: 759582
Change-Id: Iabc96357fb0741889751d2c59ba35c829e6b6863
Reviewed-on: https://chromium-review.googlesource.com/663614Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501396}