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This CL records how many times the multipaste menu shows through the
accelerator, render view's context menu and textfield's context menu
respectively.

Bug: 1164439
Change-Id: I7a9f8ab1efd21de951d353ae596536d44bb4ee01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618540Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842853}