Fix date picker datalist suggestion dropdown size with use-zoom-for-dsf.

Fix date picker datalist suggestion dropdown size with use-zoom-for-dsf.

When a date picker has a suggestion list it's supposed to be the same
width as the input element. With use-zoom-for-dsf on I discovered that
it was too wide because the width that was being passed in was using
"root frame" coords that were not scaled correctly.

BUG=621221
Review-Url: https://codereview.chromium.org/2095113002
Cr-Commit-Position: refs/heads/master@{#403394}
(cherry picked from commit 0e94f26e8f22e96fda6ade9ccb35380906ee77ab)

Committed: https://chromium.googlesource.com/chromium/src/+/2d0823f5455d1a2918b764006a7dad26106bfc5e

[Bret, 2016-07-06 18:09:56]

Description was changed from

==========
Fix date picker datalist suggestion dropdown size with use-zoom-for-dsf.

When a date picker has a suggestion list it's supposed to be the same
width as the input element. With use-zoom-for-dsf on I discovered that
it was too wide because the width that was being passed in was using
"root frame" coords that were not scaled correctly.

BUG=621221

Review-Url: https://codereview.chromium.org/2095113002
Cr-Commit-Position: refs/heads/master@{#403394}
(cherry picked from commit 0e94f26e8f22e96fda6ade9ccb35380906ee77ab)
==========

to

==========
Fix date picker datalist suggestion dropdown size with use-zoom-for-dsf.

When a date picker has a suggestion list it's supposed to be the same
width as the input element. With use-zoom-for-dsf on I discovered that
it was too wide because the width that was being passed in was using
"root frame" coords that were not scaled correctly.

BUG=621221

Review-Url: https://codereview.chromium.org/2095113002
Cr-Commit-Position: refs/heads/master@{#403394}
(cherry picked from commit 0e94f26e8f22e96fda6ade9ccb35380906ee77ab)

Committed:
https://chromium.googlesource.com/chromium/src/+/2d0823f5455d1a2918b764006a7d...
==========

[Bret, 2016-07-06 18:09:58]

Committed patchset #1 (id:1) manually as
2d0823f5455d1a2918b764006a7dad26106bfc5e.