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When visiting chrome://sync-internals, a checkbox labeled "Capture
Specifics" is available. It controls whether the specifics of each sync
event are captured in the log displayed on the page.

Every time the page is refreshed or reopened, this checkbox is reset to
its initial, unchecked state. The flag is immensely useful for
debugging, but having to check the checkbox after each browser restart
or reopen of the page is cumbersome.

To that end, add a command-line switch "--sync-include-specifics" which
will set the initial value for the "Capture Specifics" flag on
chrome://sync-internals page load to true.

Bug: 859878
Change-Id: I43b04e2d3aabdda2e8f3bc64cb80f906f56c78b2
Reviewed-on: https://chromium-review.googlesource.com/1147221
Commit-Queue: David Davidović <davidovic@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582613}