Add configuration_changed event and set_background_opacity request.

Add configuration_changed event and set_background_opacity request.

* remote shell API version is updated to 9.

* Send the current primary display info because primary display is dynamic and can change or even go away.

* This also fixed a bug where a underlay wasn't created when it started maximized.

BUG=632083
TEST=tested on new and old impl on android side. Updated unit test.

Review-Url: https://codereview.chromium.org/2189073003
Cr-Commit-Position: refs/heads/master@{#409089}
(cherry picked from commit 80d20b2f6bc5a6aa8e0caa37f517aef783d3186d)

Review URL: https://codereview.chromium.org/2204063002 .
    
Cr-Commit-Position: refs/branch-heads/2785@{#474}
Cr-Branched-From: 68623971be0cfc492a2cb0427d7f478e7b214c24-refs/heads/master@{#403382}

[oshima, 2016-08-03 00:51:39]

Description was changed from

==========
Add configuration_changed event and set_background_opacity request.

* remote shell API version is updated to 9.

* Send the current primary display info because primary display is dynamic and
can change or even go away.

* This also fixed a bug where a underlay wasn't created when it started
maximized.

BUG=632083
TEST=tested on new and old impl on android side. Updated unit test.

Review-Url: https://codereview.chromium.org/2189073003
Cr-Commit-Position: refs/heads/master@{#409089}
(cherry picked from commit 80d20b2f6bc5a6aa8e0caa37f517aef783d3186d)
==========

to

==========
Add configuration_changed event and set_background_opacity request.

* remote shell API version is updated to 9.

* Send the current primary display info because primary display is dynamic and
can change or even go away.

* This also fixed a bug where a underlay wasn't created when it started
maximized.

BUG=632083
TEST=tested on new and old impl on android side. Updated unit test.

Review-Url: https://codereview.chromium.org/2189073003
Cr-Commit-Position: refs/heads/master@{#409089}
(cherry picked from commit 80d20b2f6bc5a6aa8e0caa37f517aef783d3186d)

Review URL: https://codereview.chromium.org/2204063002 .
    
Cr-Commit-Position: refs/branch-heads/2785@{#474}
Cr-Branched-From:
68623971be0cfc492a2cb0427d7f478e7b214c24-refs/heads/master@{#403382}
==========

[oshima, 2016-08-03 00:51:58]

it's merged but git somehow failed to update CL. closing