GitLab

Modify tracing_ui.cc to add record-as-much-as-possible mode for about://tracing.
This time, the roll should decrease trace-viewer size from 1.6 M -> 1.4 M with
minification using rjsmin.

Verified that the size of resources.pak reduces from 17278967 to 16888789.

BUG=396081, 471610, 469646

Review URL: https://codereview.chromium.org/1066903002

Cr-Commit-Position: refs/heads/master@{#324192}