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This CL contains constants for the
Blob Async Transport refactor.

Note: This CL is currently a no-op, hookup is in the 'Hookup' patch.

Patches:
1: https://codereview.chromium.org/1287303002 (Committed!)
2: https://codereview.chromium.org/1288373002
3: https://codereview.chromium.org/1292523002
4: https://codereview.chromium.org/1098853003
Hookup: https://codereview.chromium.org/1234813004

BUG=375297

Review URL: https://codereview.chromium.org/1288373002

Cr-Commit-Position: refs/heads/master@{#357248}