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Add Http2MockLog and macros in net/third_party/http2/platform.
Remove small divergences from internal code.
Add HpackEntryTypeTest.OutputHpackEntryType test.

This lands server side change 221917881 by bnc.

Bug: 488484

Change-Id: I936519be0dff2bbee4a49f3b0af9e8ee699d2831
Reviewed-on: https://chromium-review.googlesource.com/c/1341199
Commit-Queue: Dianna Hu <diannahu@chromium.org>
Reviewed-by: Dianna Hu <diannahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609920}