Include DEBUG:I information into logcat.

Stack traces are presented as DEBUG:I, but the previous logcat filter
does not include such logcat.

In this cl, we are including DEBUG:I into the logcat.

BUG=721811

Review-Url: https://codereview.chromium.org/2882793002
Cr-Commit-Position: refs/heads/master@{#472172}

build/android/pylib/local/device/local_device_instrumentation_test_run.py

@@ -50,7 +50,7 @@ TIMEOUT_ANNOTATIONS = [
   ('SmallTest', 1 * 60),
 ]
 
-LOGCAT_FILTERS = ['*:e', 'chromium:v', 'cr_*:v']
+LOGCAT_FILTERS = ['*:e', 'chromium:v', 'cr_*:v', 'DEBUG:I']
 
 EXTRA_SCREENSHOT_FILE = (
     'org.chromium.base.test.ScreenshotOnFailureStatement.ScreenshotFile')