Speed up download_android_tools.py by about a third.

Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve the time this takes on travis
where it's even slower.

BUG=
R=jamesr@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/38633db5eccca39059a1149700f38c2639b7dcb4

[tonyg, 2016-01-11 22:05:01]

Description was changed from

==========
Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve this time this takes on travis
where it's even slower.

BUG=
==========

to

==========
Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve this time this takes on travis
where it's even slower.

BUG=
==========

[tonyg, 2016-01-11 22:05:01]

tonyg@chromium.org changed reviewers:
+ jamesr@chromium.org

[jamesr, 2016-01-11 22:07:18]

lgtm

[tonyg, 2016-01-11 22:09:24]

Description was changed from

==========
Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve this time this takes on travis
where it's even slower.

BUG=
==========

to

==========
Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve the time this takes on travis
where it's even slower.

BUG=
==========

[tonyg, 2016-01-11 22:09:55]

Description was changed from

==========
Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve the time this takes on travis
where it's even slower.

BUG=
==========

to

==========
Speed up download_android_tools.py by about a third.

This moves extracting off of the main thread, so that it can be done in
parallel with downloading. On my machine, this goes from about 76s ->
51s. But my motivation is to improve the time this takes on travis
where it's even slower.

BUG=
R=jamesr@chromium.org

Committed:
https://chromium.googlesource.com/external/mojo/+/38633db5eccca39059a1149700f...
==========

[tonyg, 2016-01-11 22:09:56]

Committed patchset #1 (id:1) manually as
38633db5eccca39059a1149700f38c2639b7dcb4 (presubmit successful).