Return null when selected text is empty

Return null when selected text is empty

InputConnection#getSelectedText() should return null when the selection
is empty. ThreadedInputConnection was not doing this correctly, and confused
some OEM keyboards.

BUG=638201
Committed: https://crrev.com/fe62ee1b4b965d3c63bee8f2d0df160ae4529ae0
Cr-Commit-Position: refs/heads/master@{#414821}

[Changwan Ryu, 2016-08-26 15:04:48]

The CQ bit was checked by changwan@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-26 15:05:02]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Changwan Ryu, 2016-08-26 15:17:11]

changwan@chromium.org changed reviewers:
+ aelias@chromium.org, tedchoc@chromium.org

[Changwan Ryu, 2016-08-26 15:17:12]

PTAL

[Ted C, 2016-08-26 16:18:07]

lgtm

[commit-bot: I haz the power, 2016-08-26 16:34:00]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-26 16:34:00]

Dry run: Try jobs failed on following builders:
  linux_android_rel_ng on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[aelias_OOO_until_Jul13, 2016-08-26 18:54:20]

lgtm

[Changwan Ryu, 2016-08-26 20:51:50]

The CQ bit was checked by changwan@chromium.org

[Changwan Ryu, 2016-08-26 20:51:50]

The patchset sent to the CQ was uploaded after l-g-t-m from
tedchoc@chromium.org, aelias@chromium.org
Link to the patchset: https://codereview.chromium.org/2279293002/#ps40001
(title: "fixed a failing test")

[commit-bot: I haz the power, 2016-08-26 20:52:51]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-26 21:45:52]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-08-26 21:48:30]

Description was changed from

==========
Return null when selected text is empty

InputConnection#getSelectedText() should return null when the selection
is empty. ThreadedInputConnection was not doing this correctly, and confused
some OEM keyboards.

BUG=638201
==========

to

==========
Return null when selected text is empty

InputConnection#getSelectedText() should return null when the selection
is empty. ThreadedInputConnection was not doing this correctly, and confused
some OEM keyboards.

BUG=638201

Committed: https://crrev.com/fe62ee1b4b965d3c63bee8f2d0df160ae4529ae0
Cr-Commit-Position: refs/heads/master@{#414821}
==========

[commit-bot: I haz the power, 2016-08-26 21:48:31]

Patchset 3 (id:??) landed as
https://crrev.com/fe62ee1b4b965d3c63bee8f2d0df160ae4529ae0
Cr-Commit-Position: refs/heads/master@{#414821}