Viktar Donich 52c943d88e Make horizontal scrolling visible on diff page
Diff header scrolls with content and sticks to the top.
Implemented custom gr-header wrapper to accomodate this.

Bug: Issue 4491
Change-Id: I451ecd4f6c454fd9ab3085ad8f9c5bdd27cb9269
2016-10-28 12:31:58 -07:00
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