ChromeOS: Add SystemTimezoneAutomaticDetection policy.

This CL adds SystemTimezoneAutomaticDetection device policy
and modifies all necessary components to support it.

BUG=596690
TEST=unittest,browsertest

Review URL: https://codereview.chromium.org/1843523002

Cr-Original-Commit-Position: refs/heads/master@{#384768}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: fc3524a0efece0f2b55b08980b74c23be65ed8dd
1 file changed
tree: 575ab07e994ff07fefd47e215c64c429bf2f27b6
  1. chrome_device_policy.proto
  2. install_attributes.proto