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When rotating the screen on iPad with the keyboard showing, for some
reason the host view will become improperly laid out. Part of the view
gets overlaid by the keyboard.

My suspicion is the view frame becomes inconsistent when the rotation
happens.

This CL fixes the problem by reworking the keyboard layout using
constraints. It also makes GLRenderer cache the view size before the
canvas is created.

Bug: 751273
Change-Id: I5146ff6bf602eef1857259e5e50ca6be1d952a68
Reviewed-on: https://chromium-review.googlesource.com/596913
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Scott Nichols <nicholss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491519}