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Now when copying multiple files, the shown icon is based on the
extension of the last copied file, which is unexpected. This CL
does the following things:
(1) Implement the API to get the count of copied files for the given
clipboard data
(2) Show the correct icon according to the count of copied files.

Bug: 1165309
Change-Id: I63222e7037fcc38683ba3c6a0be3dd080f424dcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628735Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843747}