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Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d6f9bf745b118e7d12d8b1e01782070477760da4

commit d6f9bf745b118e7d12d8b1e01782070477760da4
Author: Owen Min <zmin@chromium.org>
Date: Sun Apr 15 00:36:10 2018

Implement a helper function that builds ChromeDesktopReportRequest.

Building the protobuf based on
Input from extension API:
1) Machine name
2) OS information (x86/x64)
3) OS User
4) Chrome Profile and its extensions/plugins
Other information that is stored in Chrome.
1) OS Information (Platform name and its version)
2) Browser version/channel.
3) Current profile ID based on its path
4) All policies affect the current profile.

Please note that only one profile will be added into the report.

Bug:  832896 

Change-Id: I703ff554932388611c9839473b7dcadcf0cac3c1
Reviewed-on: https://chromium-review.googlesource.com/986946
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Marc-André Decoste <mad@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#550596}(cherry picked from commit 614a8266aafcbc072a4459ddc57006cf78d43de1)
Reviewed-on: https://chromium-review.googlesource.com/1013341
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#9}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/d6f9bf745b118e7d12d8b1e01782070477760da4/chrome/browser/extensions/BUILD.gn
[add] https://crrev.com/d6f9bf745b118e7d12d8b1e01782070477760da4/chrome/browser/extensions/api/enterprise_reporting_private/chrome_desktop_report_request_helper.cc
[add] https://crrev.com/d6f9bf745b118e7d12d8b1e01782070477760da4/chrome/browser/extensions/api/enterprise_reporting_private/chrome_desktop_report_request_helper.h
[add] https://crrev.com/d6f9bf745b118e7d12d8b1e01782070477760da4/chrome/browser/extensions/api/enterprise_reporting_private/chrome_desktop_report_request_helper_unittest.cc
[modify] https://crrev.com/d6f9bf745b118e7d12d8b1e01782070477760da4/chrome/browser/extensions/api/enterprise_reporting_private/enterprise_reporting_private_api.cc
[modify] https://crrev.com/d6f9bf745b118e7d12d8b1e01782070477760da4/chrome/test/BUILD.gn