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This adds a presubmit check in the support library that all references
to InvocationHandlers should be annotated with the type they represent.

Annotations take the form of comments:

/* RetType */ InvocationHandler m(/* ParamType */ InvocationHandler p);

This intentionally skips import statements. The presubmit check is only
a warning, in case of false-positive.

Bug: 842022
Test: git cl presubmit -f --upload
Change-Id: I298d488d14f4fe828b02f4ac062bba6d4b1e9ae8
Reviewed-on: https://chromium-review.googlesource.com/1059009Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558817}