Import adb_profile_chrome.py from upstream Chromium

This patch imports the adb_profile_chrome.py script from upstream
Chromium to replace the previous adb_trace.py. It supports more complex
use cases such as combined Chrome + Systracing, setting trace
categories, compressing trace files, continuous and timed tracing modes.

The patch also pulls along some dependencies from the Chromium
repository under third_party.
Merge pull request #6 from skyostil/master

Import adb_profile_chrome.py from upstream Chromium