Merge TagAppStart and UpdateCurrentAppInfo.

Merge TagAppStart and UpdateCurrentAppInfo.

Removes TagAppStart as its functionality is redundant. Also
separates out updating SDK info into UpdateSDKInfo.

R=byungchul@chromium.org
BUG=

Committed: https://crrev.com/3e1f0ec32f25b1a703e8858688a0e280a5e6500e
Cr-Commit-Position: refs/heads/master@{#311300}

[byungchul, 2015-01-13 17:30:01]

lgtm

https://codereview.chromium.org/836923003/diff/1/chromecast/base/metrics/cast...
File chromecast/base/metrics/cast_metrics_helper.cc (right):

https://codereview.chromium.org/836923003/diff/1/chromecast/base/metrics/cast...
chromecast/base/metrics/cast_metrics_helper.cc:123:
TagAppStartForGroupedHistograms(app_id_);
Clear sdk_version.

[byungchul, 2015-01-13 17:30:36]

byungchul@chromium.org changed reviewers:
+ gunsch@chromium.org, lcwu@chromium.org

[derekjchow1, 2015-01-13 17:30:45]

The CQ bit was checked by derekjchow@chromium.org

[commit-bot: I haz the power, 2015-01-13 17:31:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/836923003/1

[commit-bot: I haz the power, 2015-01-13 17:31:45]

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

[commit-bot: I haz the power, 2015-01-13 17:31:46]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[gunsch, 2015-01-13 17:33:27]

Commit message nits:
* it's --> its
* remove duplicate first line

And please address byungchul's comment before submitting

[derekjchow1, 2015-01-13 18:11:18]

Updated commit message.

https://codereview.chromium.org/836923003/diff/1/chromecast/base/metrics/cast...
File chromecast/base/metrics/cast_metrics_helper.cc (right):

https://codereview.chromium.org/836923003/diff/1/chromecast/base/metrics/cast...
chromecast/base/metrics/cast_metrics_helper.cc:123:
TagAppStartForGroupedHistograms(app_id_);
On 2015/01/13 17:30:01, byungchul wrote:
> Clear sdk_version.

Done.

[gunsch, 2015-01-13 18:13:11]

lgtm

[derekjchow1, 2015-01-13 18:17:24]

The CQ bit was checked by derekjchow@chromium.org

[commit-bot: I haz the power, 2015-01-13 18:18:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/836923003/20001

[commit-bot: I haz the power, 2015-01-13 18:57:04]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-13 18:58:33]

Patchset 2 (id:??) landed as
https://crrev.com/3e1f0ec32f25b1a703e8858688a0e280a5e6500e
Cr-Commit-Position: refs/heads/master@{#311300}