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New member variables are added to SelectionBound, but no update read/write
IPC param traits. The CL adds them.

Bug: 1015274
Change-Id: I1480741a981fe831e684bdea10752f43682a934d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1916180Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jinsong Fan <fanjinsong@sogou-inc.com>
Cr-Commit-Position: refs/heads/master@{#716012}