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Pointer::SetCursor() is now required to be called in response to
focus change events. This provides more seamless cursor changes
as the cursor will remain the same until it has been re-defined.

Simply clients that never define the cursor will now get the
default cursor instead of no cursor at all. Clients that draw
their own cursor now have a chance to provide a new frame before
the cursor is changed.

BUG=549781

Review-Url: https://codereview.chromium.org/2028443002
Cr-Commit-Position: refs/heads/master@{#396919}