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This CL implements mojo::internal::MessageQuotaChecker, that allows
unread message quota checking to be performed at send-time in
IPC::ChannelProxy. This in turn allows generating crash dumps with
the abusive producer on the call stack, red handed.

Bug: 1017827
Change-Id: Ib0a7f5cde2c9df00c89bb79834c1cffa211fa6f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899909Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714591}