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This change moves gamepad_mojom_traits to device/gamepad/public/cpp and
creates a shared component for them to be specified as a dependency in
gamepad.typemap. This will enable GamepadSharedMemoryReader to depend on
the traits after the move to blink.

Bug: 612330
Change-Id: I688a981313ec90a8c5bf909b0df4bb3e1f711388
Reviewed-on: https://chromium-review.googlesource.com/1103612Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568154}