GitLab

Also move FLAGS_chromium_http2_flag_h2_on_stream_pad_length from
spdy/chromium/spdy_flags.{h,cc} to
spdy/platform/impl/spdy_flags_impl.{h,cc}, and rename to
h2_on_stream_pad_length.

This CL merges server side changes 182949930 by jtoohill
and 182975401 by diannahu.

Bug: 488484
Change-Id: I1dc62b04a0529261bc72f498dd2987a8dd2f748c
Reviewed-on: https://chromium-review.googlesource.com/887903Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532107}