Fixed bug #14266: fix observation of NSView size change

Previously, we started observing for NSView size changes *before*
we actually create the NSView. i.e. we observe nothing.
Now we start observing after the NSView is created.

Change-Id: I3eb86e9982caae464fffe1c8cfc19035a194ec27
Merge topic 'bug14266' into master

b6a4db16 Fixed bug #14266: fix observation of NSView size change