Changed behavior when no files require coverage.

Changed behavior when no files require coverage.

The android_coverage recipe expects a result file to be saved to the --out directory
regardless of if there were files requiring code coverage or not. If no files
require coverage, the script will now save an empty object to the output
file instead of returning early.

BUG=

Committed: https://crrev.com/1167cb33649c82a33bd18f8c08333113458939ff
Cr-Commit-Position: refs/heads/master@{#342957}

[estevenson1, 2015-08-11 23:26:40]

estevenson@google.com changed reviewers:
+ jbudorick@chromium.org, mikecase@chromium.org

[mikecase (-- gone --), 2015-08-11 23:43:55]

lgtm with nit

https://codereview.chromium.org/1290593002/diff/1/build/android/emma_coverage...
File build/android/emma_coverage_stats.py (right):

https://codereview.chromium.org/1290593002/diff/1/build/android/emma_coverage...
build/android/emma_coverage_stats.py:459: 
nit: Add back the logging statement you removed in an else block here.

[estevenson1, 2015-08-11 23:48:16]

https://codereview.chromium.org/1290593002/diff/1/build/android/emma_coverage...
File build/android/emma_coverage_stats.py (right):

https://codereview.chromium.org/1290593002/diff/1/build/android/emma_coverage...
build/android/emma_coverage_stats.py:459: 
On 2015/08/11 at 23:43:55, mikecase wrote:
> nit: Add back the logging statement you removed in an else block here.

Done.

[estevenson1, 2015-08-11 23:48:27]

The CQ bit was checked by estevenson@google.com

[estevenson1, 2015-08-11 23:48:28]

The patchset sent to the CQ was uploaded after l-g-t-m from
mikecase@chromium.org
Link to the patchset: https://codereview.chromium.org/1290593002/#ps20001
(title: "Added logging statement.")

[commit-bot: I haz the power, 2015-08-11 23:48:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1290593002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1290593002/20001

[estevenson1, 2015-08-11 23:58:27]

The CQ bit was unchecked by estevenson@google.com

[jbudorick, 2015-08-12 01:17:53]

lgtm

[estevenson1, 2015-08-12 01:18:04]

The CQ bit was checked by estevenson@google.com

[commit-bot: I haz the power, 2015-08-12 01:18:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1290593002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1290593002/20001

[commit-bot: I haz the power, 2015-08-12 01:28:38]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-12 01:29:22]

Patchset 2 (id:??) landed as
https://crrev.com/1167cb33649c82a33bd18f8c08333113458939ff
Cr-Commit-Position: refs/heads/master@{#342957}