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Add API key for remoting to use during the signaling process. Note that
this key is only used by Chrome Remote Desktop and will not be used in
the Chrome browser.

Internal CL: https://chrome-internal-review.googlesource.com/c/chrome/google_apis/internal/+/831973

Bug: 927962
Change-Id: Iecfa48aebe1078a4a0c747f42711000d9155fc3f
Reviewed-on: https://chromium-review.googlesource.com/c/1450409Reviewed-by: Joe Downing <joedow@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Auto-Submit: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630352}