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Android task runner posts Runnable tasks and the tasks are run by native
task runner. All these tasks are recorded with posted location as
post_task_android.cc. To track the correct posted location, this cl adds
new trace events to track the runnable class name.
Note that we still track the wrapper task runner in some cases like
ChainedTasks and AsyncTask$NamedFutureTask, which needs to be fixed.

BUG=1136635

Change-Id: I97b35b003ce7d5571ce4a44c54127da74400cf1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480715
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821378}