This API wasn't working on non chromeos platforms because
commit31eac8332a606e63d35756ad2106d545bea90677
authoroshima <oshima@chromium.org>
Fri, 19 Sep 2014 18:05:10 +0000 (19 11:05 -0700)
committerCommit bot <commit-bot@chromium.org>
Fri, 19 Sep 2014 18:05:30 +0000 (19 18:05 +0000)
tree4f51591bdd66e0dcfedd97ce13afb8a3af8d96dd
parentd7dd48b1c3af2de5d8e4e05b5e9e40008617c68f
This API wasn't working on non chromeos platforms because
it wasn't observing the display change.

BUG=316217
TEST=install the test app attached in the bug and change the scree resolution.

Review URL: https://codereview.chromium.org/581023003

Cr-Commit-Position: refs/heads/master@{#295733}
chrome/browser/extensions/display_info_provider_aura.cc
chrome/browser/extensions/display_info_provider_mac.cc
chrome/browser/extensions/display_info_provider_win.cc