[android] Change the recommended log tag format to "cr_foo"

[android] Change the recommended log tag format to "cr_foo"

This is to ensure that log tags are not elided when retrieving
logcat output from crash reports. The log function has been
modified to make the transition easier and avoid specifying
the prefix everywhere.

This patch also moves some eliding testing from instrumentation
tests to junit tests, and adds a test to ensure that the new
tag format is not elided.

BUG=533072
Committed: https://crrev.com/38736db9311bb4b03e6f555d71dc98b7fd341d37
Cr-Commit-Position: refs/heads/master@{#349733}

[dgn, 2015-09-17 20:46:07]

dgn@chromium.org changed reviewers:
+ bauerb@chromium.org, jochen@chromium.org

[dgn, 2015-09-17 20:46:07]

PTAL. I just sent an email to the internal team list for context.

[jochen (gone - plz use gerrit), 2015-09-18 08:34:03]

presubmit lgtm

[Bernhard Bauer, 2015-09-18 09:05:56]

lgtm

[dgn, 2015-09-18 12:08:08]

dgn@chromium.org changed reviewers:
+ rmcilroy@chromium.org

[dgn, 2015-09-18 12:08:08]

PTAL: I made the log functions update the tag (this is happening only when we
know we will log), updated presubmit to not require the prefix and warn when the
tag contains '.'

[Bernhard Bauer, 2015-09-18 13:02:56]

still lgtm

[rmcilroy, 2015-09-18 13:31:27]

base/android lgtm.

[dgn, 2015-09-18 15:50:48]

The CQ bit was checked by dgn@chromium.org

[dgn, 2015-09-18 15:50:49]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1354723004/#ps40001
(title: "Added tag normalization in the log functions")

[commit-bot: I haz the power, 2015-09-18 15:51:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1354723004/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1354723004/40001

[commit-bot: I haz the power, 2015-09-18 16:02:37]

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

[commit-bot: I haz the power, 2015-09-18 16:02:38]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[dgn, 2015-09-18 16:18:43]

The CQ bit was checked by dgn@chromium.org

[dgn, 2015-09-18 16:18:43]

The patchset sent to the CQ was uploaded after l-g-t-m from bauerb@chromium.org,
jochen@chromium.org, rmcilroy@chromium.org
Link to the patchset: https://codereview.chromium.org/1354723004/#ps60001
(title: "Fix presubmit test broken by another CL")

[commit-bot: I haz the power, 2015-09-18 16:18:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1354723004/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1354723004/60001

[commit-bot: I haz the power, 2015-09-18 19:20:57]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-09-18 19:22:03]

Patchset 4 (id:??) landed as
https://crrev.com/38736db9311bb4b03e6f555d71dc98b7fd341d37
Cr-Commit-Position: refs/heads/master@{#349733}