Update selection region style

Update selection region style

* use simple gray region
* use gray for unselected regions instead.
* use darker gray for unselected region
* Instead of using platform cursor, draw pseudo cursor when selecting region

BUG=608269
Review-Url: https://codereview.chromium.org/1997193002
Cr-Commit-Position: refs/heads/master@{#397498}
(cherry picked from commit ef6f5af980b06e664d0cd9dc7cb578d6862b6c36)

Committed: https://chromium.googlesource.com/chromium/src/+/1a5840e8c54cb8995daadbba7300128fd0fc43b0

[oshima, 2016-06-04 00:03:42]

Patchset #1 (id:1) has been deleted

[oshima, 2016-06-04 00:05:44]

Description was changed from

==========
Update selection region style

* use simple gray region
* use gray for unselected regions instead.
* use darker gray for unselected region
* Instead of using platform cursor, draw pseudo cursor when selecting region

BUG=608269

Review-Url: https://codereview.chromium.org/1997193002
Cr-Commit-Position: refs/heads/master@{#397498}
(cherry picked from commit ef6f5af980b06e664d0cd9dc7cb578d6862b6c36)
==========

to

==========
Update selection region style

* use simple gray region
* use gray for unselected regions instead.
* use darker gray for unselected region
* Instead of using platform cursor, draw pseudo cursor when selecting region

BUG=608269

Review-Url: https://codereview.chromium.org/1997193002
Cr-Commit-Position: refs/heads/master@{#397498}
(cherry picked from commit ef6f5af980b06e664d0cd9dc7cb578d6862b6c36)
==========

[oshima, 2016-06-13 23:23:35]

Description was changed from

==========
Update selection region style

* use simple gray region
* use gray for unselected regions instead.
* use darker gray for unselected region
* Instead of using platform cursor, draw pseudo cursor when selecting region

BUG=608269

Review-Url: https://codereview.chromium.org/1997193002
Cr-Commit-Position: refs/heads/master@{#397498}
(cherry picked from commit ef6f5af980b06e664d0cd9dc7cb578d6862b6c36)
==========

to

==========
Update selection region style

* use simple gray region
* use gray for unselected regions instead.
* use darker gray for unselected region
* Instead of using platform cursor, draw pseudo cursor when selecting region

BUG=608269

Review-Url: https://codereview.chromium.org/1997193002
Cr-Commit-Position: refs/heads/master@{#397498}
(cherry picked from commit ef6f5af980b06e664d0cd9dc7cb578d6862b6c36)

Committed:
https://chromium.googlesource.com/chromium/src/+/1a5840e8c54cb8995daadbba7300...
==========

[oshima, 2016-06-13 23:23:36]

Committed patchset #2 (id:40001) manually as
1a5840e8c54cb8995daadbba7300128fd0fc43b0.