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Adds support to get the views find bar text to the global pasteboard.
Also fixes a Cocoa bug introduced in the previous pasteboard change
where the selection is always reset to the beginning at every keystroke.

BUG=826478,827189,842131

Change-Id: If1a639f1997e3fea7fee2c66959e7dcdb2fd3bc7
Reviewed-on: https://chromium-review.googlesource.com/1055195
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557902}