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This change adds ReportQueue for generating reports.

File Changes:
~ chrome/browser/
| ~ BUILD.gn
| | Add report_queue.h to the buildable unit.
| ~ policy/messaging_layer/
| | ~ proto/record.proto
| | | Change EncryptedRecord::encrypted_wrapped_record from byte to
| | | string. Behind the scenes they are treated the same, but in
| | | practice it is easier to work with std::string().
| | + proto/test.proto
| | | Adds a test proto for testing.
| | + public/report_queue.h/cc
| | | Add ReportQueue, temporary StorageModule and temporary
| | | EncryptionModule.
| | + public/report_queue_unittest.cc
| | | Add tests for ReportQueue
| | ~ public/report_queue_configuration_unittest.cc
| | | Import missing library.
~ chrome/test/BUILD.gn
| Add unit tests and test proto.

Bug: chromium:1078512
Change-Id: If3fff7ac59e7d4a486d47ab87148cb27020c2866
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191201Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Zach Trudo <zatrudo@google.com>
Cr-Commit-Position: refs/heads/master@{#774354}