[Merge to 2785] Fix omnibox flickering on macOS Sierra.

[Merge to 2785] Fix omnibox flickering on macOS Sierra.

> The implementation of -[AutocompleteTextFieldEditor interpretKeyEvents:]
> invalidates layout twice, in ways that are somehow not compatible on macOS
> Sierra. This causes repaints on the next two frames, the first of which does
> not paint the text correctly. Forcing an explicit relayout causes there to be
> only a single repaint, with the correct contents.
>
> BUG=634318
>
> Review-Url: https://codereview.chromium.org/2237003004
> Cr-Commit-Position: refs/heads/master@{#411495}
> (cherry picked from commit c95767396148abe3e0b7d2ac07262a90dd76a6ae)

Committed: https://chromium.googlesource.com/chromium/src/+/0c384764c4aaf6c453f0cf80fb2fdecc9124e472

[erikchen, 2016-08-15 18:26:40]

Description was changed from

==========
[Merge to 2785] Fix omnibox flickering on macOS Sierra.

> The implementation of -[AutocompleteTextFieldEditor interpretKeyEvents:]
> invalidates layout twice, in ways that are somehow not compatible on macOS
> Sierra. This causes repaints on the next two frames, the first of which does
> not paint the text correctly. Forcing an explicit relayout causes there to be
> only a single repaint, with the correct contents.
>
> BUG=634318
>
> Review-Url: https://codereview.chromium.org/2237003004
> Cr-Commit-Position: refs/heads/master@{#411495}
> (cherry picked from commit c95767396148abe3e0b7d2ac07262a90dd76a6ae)
==========

to

==========
[Merge to 2785] Fix omnibox flickering on macOS Sierra.

> The implementation of -[AutocompleteTextFieldEditor interpretKeyEvents:]
> invalidates layout twice, in ways that are somehow not compatible on macOS
> Sierra. This causes repaints on the next two frames, the first of which does
> not paint the text correctly. Forcing an explicit relayout causes there to be
> only a single repaint, with the correct contents.
>
> BUG=634318
>
> Review-Url: https://codereview.chromium.org/2237003004
> Cr-Commit-Position: refs/heads/master@{#411495}
> (cherry picked from commit c95767396148abe3e0b7d2ac07262a90dd76a6ae)

Committed:
https://chromium.googlesource.com/chromium/src/+/0c384764c4aaf6c453f0cf80fb2f...
==========

[erikchen, 2016-08-15 18:26:42]

Committed patchset #1 (id:1) manually as
0c384764c4aaf6c453f0cf80fb2fdecc9124e472.