Make sure progress bar is attached before init

Make sure progress bar is attached before init

This change makes sure that the progress bar has been attached to the
hierarchy before trying to initialize it. Many of the null checks have
also been removed since the progress bar is now created in the
constructor.

BUG=716382
Review-Url: https://codereview.chromium.org/2853943002
Cr-Commit-Position: refs/heads/master@{#468532}
Committed: https://chromium.googlesource.com/chromium/src/+/2efffa89a050e8d0c3c6829f7bd63eb3970f0eaa

[mdjones, 2017-05-02 01:09:40]

Description was changed from

==========
Make sure progress bar is attached before init

This change makes sure that the progress bar has been attached to the
hierarchy before trying to initialize it.

BUG=716382
==========

to

==========
Make sure progress bar is attached before init

This change makes sure that the progress bar has been attached to the
hierarchy before trying to initialize it. Many of the null checks have
also been removed since the progress bar is now created in the
constructor.

BUG=716382
==========

[mdjones, 2017-05-02 01:10:16]

mdjones@chromium.org changed reviewers:
+ dfalcantara@chromium.org

[mdjones, 2017-05-02 01:10:16]

plz

[gone, 2017-05-02 01:13:14]

lgtm

[gone, 2017-05-02 01:13:17]

The CQ bit was checked by dfalcantara@chromium.org

[commit-bot: I haz the power, 2017-05-02 01:13:44]

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, 2017-05-02 02:01:05]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493687597452570, "parent_rev":
"bce3863fc28dc7a2b05eb37a1055b2d43f8002a8", "commit_rev":
"2efffa89a050e8d0c3c6829f7bd63eb3970f0eaa"}

[commit-bot: I haz the power, 2017-05-02 02:01:16]

Description was changed from

==========
Make sure progress bar is attached before init

This change makes sure that the progress bar has been attached to the
hierarchy before trying to initialize it. Many of the null checks have
also been removed since the progress bar is now created in the
constructor.

BUG=716382
==========

to

==========
Make sure progress bar is attached before init

This change makes sure that the progress bar has been attached to the
hierarchy before trying to initialize it. Many of the null checks have
also been removed since the progress bar is now created in the
constructor.

BUG=716382

Review-Url: https://codereview.chromium.org/2853943002
Cr-Commit-Position: refs/heads/master@{#468532}
Committed:
https://chromium.googlesource.com/chromium/src/+/2efffa89a050e8d0c3c6829f7bd6...
==========

[commit-bot: I haz the power, 2017-05-02 02:01:16]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/2efffa89a050e8d0c3c6829f7bd6...