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The process of fixing these tests uncovered a real bug in the Cocoa
BrowserActionsContainerView: it was always resizable even when highlighting.
This change:

1) Fixes that bug;
2) Adds an abstract CanBeResized test helper;
3) Implements that test helper for Cocoa and Views windows;
4) Marks the two drag & drop tests as Views-window-only, since the mechanics of
   drag & drop aren't exactly compatible between the two platforms.

Bug: 817408
Change-Id: I3a1316df05ff5aa1b3ae29c815fec6bac8062ad1
Reviewed-on: https://chromium-review.googlesource.com/963289
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543398}