[Merge] [Android] Fix logcat extraction code.

[Merge] [Android] Fix logcat extraction code.

Currently, logcat extraction often fails, because the Process's output
buffer gets saturated with the logcat output.  I've reimplemented the
code to manually grab the last N lines of the logcat output, and this
implementation should avoid the buffer saturation issue.

Note: When the logcat extraction fails, it actually causes the thread to
hang, which means that crash reports don't get processed!

BUG=654155
TEST=junit_tests
R=mariakhomenko@chromium.org

Review-Url: https://codereview.chromium.org/2400403002
Cr-Commit-Position: refs/heads/master@{#424277}
(cherry picked from commit a8aba3c20875329d9f977253d5375552c33d6b4c)

Committed: https://chromium.googlesource.com/chromium/src/+/7a2b5a6385d8e82c72df9a20375801bc90e136d0

[Ilya Sherman, 2016-10-13 22:11:33]

Description was changed from

==========
[Merge] [Android] Fix logcat extraction code.

Currently, logcat extraction often fails, because the Process's output
buffer gets saturated with the logcat output.  I've reimplemented the
code to manually grab the last N lines of the logcat output, and this
implementation should avoid the buffer saturation issue.

Note: When the logcat extraction fails, it actually causes the thread to
hang, which means that crash reports don't get processed!

BUG=654155
TEST=junit_tests
R=mariakhomenko@chromium.org

Review-Url: https://codereview.chromium.org/2400403002
Cr-Commit-Position: refs/heads/master@{#424277}
(cherry picked from commit a8aba3c20875329d9f977253d5375552c33d6b4c)
==========

to

==========
[Merge] [Android] Fix logcat extraction code.

Currently, logcat extraction often fails, because the Process's output
buffer gets saturated with the logcat output.  I've reimplemented the
code to manually grab the last N lines of the logcat output, and this
implementation should avoid the buffer saturation issue.

Note: When the logcat extraction fails, it actually causes the thread to
hang, which means that crash reports don't get processed!

BUG=654155
TEST=junit_tests
R=mariakhomenko@chromium.org

Review-Url: https://codereview.chromium.org/2400403002
Cr-Commit-Position: refs/heads/master@{#424277}
(cherry picked from commit a8aba3c20875329d9f977253d5375552c33d6b4c)

Committed:
https://chromium.googlesource.com/chromium/src/+/7a2b5a6385d8e82c72df9a203758...
==========

[Ilya Sherman, 2016-10-13 22:11:35]

Committed patchset #1 (id:1) manually as
7a2b5a6385d8e82c72df9a20375801bc90e136d0.