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This patch makes PasteMode to be an enum class for better type safety
and improving code health. Using forward declaratuion in other header
files instead of including |PasteMode.h|.
Signed-off-by: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Change-Id: I74ea67e08607779cb823cb379c415263d537303f
Reviewed-on: https://chromium-review.googlesource.com/954423Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541724}