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Add TabCallback.showContextMenu. Define a new ContextMenuParams type
which is an immutable struct-like class to hold all context menu
parameters.

Pass the parameters as separate ObjectWrappers through aidl to avoid
serialization. This could be costly for long uri or data.

Only passing a basic list of parameters while discussion of what will
be needed is happening.

Bug: 1035469
Change-Id: I693ee8788d93a7ce828fcfda0e52f29dcda5b222
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2059049
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743746}