Telemetry: Fix computation of frame times in rendering stats.

The frame times and frame timestamps are now a list of lists (one list of times/
timestamps) per action. This CL fixes list indices when computing frame times in
initMainThreadStatsFromTimeline.

R=ernstm@chromium.org
BUG=338796

Review URL: https://codereview.chromium.org/175273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252722 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252722
Revert of [telemetry] Script for finding all Telemetry dependencies. (https://codereview.chromium.org/103433002/)

Reason for revert:
May have caused a performance regression, reverting to confirm.
https://code.google.com/p/chromium/issues/detail?id=345374

Original issue's description:
> [telemetry] Script for finding all Telemetry dependencies.
> 
> Given a list of Python modules, it will find all:
> - bootstrap_deps folders, recursively.
> - Python dependencies.
> - Page sets in those modules' folders.
> - Serving dirs of those page sets.
> And print a list of all files, or zip them up.
> 
> Example bot command: tools/telemetry_tools/find_dependencies -v tools/perf/run_benchmark tools/perf/run_measurement tools/perf/record_wpr content/test/gpu/run_gpu_test -z telemetry.zip
> 
> 
> BUG=311380
> TEST=Ran it.
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251298

TBR=nduca@chromium.org,tonyg@chromium.org,achuith@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=311380

Review URL: https://codereview.chromium.org/170313010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252723 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252723