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This is preparation CL to use forward declaration only header in mojo's
generated code.
If we include forward declaration only header in mojo's generated code, we need
to include mojo header files in some places where definition is necessary.

master CL is in
https://chromium-review.googlesource.com/c/chromium/src/+/1438975

This CL was uploaded by git cl split.

R=hidehiko@chromium.org

CC: rockot@google.com
Bug: 922875
Change-Id: I19d473f728ed83b62c9111f62a4fbb94b7077d77
Reviewed-on: https://chromium-review.googlesource.com/c/1446973Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628514}