[Telemetry] Change the default cold-load-percent for all page_cyclers to 50%
To PERF SHERIFFS,
This CL will result in a change in the cold and warm ranges reported by the page cyclers. As we move to a balanced load, cold page loads will be less noisy but might jump to a slightly lower range, while warm page loads should stay the same (might get a little noisier).
BUG=
Review URL: https://codereview.chromium.org/
202023004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257799 0039d316-1c4b-4281-b951-d872f2087c98