Collect Startup.FirstWebContents metrics on all channels.
commit9d5ebc5eb14fc4b3823f6cfd341da023f71f49dd
authorerikchen <erikchen@chromium.org>
Mon, 5 Jan 2015 22:07:44 +0000 (5 14:07 -0800)
committerCommit bot <commit-bot@chromium.org>
Mon, 5 Jan 2015 22:08:33 +0000 (5 22:08 +0000)
treefbba4d91583378a1fa0269f44cc8515b65f97edc
parent474ab324d17d2cd198d3fb067cabc10a775a8df7
Collect Startup.FirstWebContents metrics on all channels.

I was running an experiment to see if reducing the bucket width of the
histograms would increase the precision of the measurements (specifically the
50th and 90th percentiles). The answer is negative. Having more buckets
resulted in a difference of less than 0.1%. This CL removes the experimental
metrics, and replaces them with Startup.FirstWebContents.MainFrameLoad and
Startup.FirstWebContents.NonEmptyPaint, using standard bucket ranges.

BUG=

Review URL: https://codereview.chromium.org/816883003

Cr-Commit-Position: refs/heads/master@{#309964}
chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
chrome/browser/metrics/first_web_contents_profiler.cc
chrome/browser/metrics/first_web_contents_profiler.h
tools/metrics/histograms/histograms.xml