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The default for an "is empty" value should be true to better match
reality. This is breaking the case where an offscreen webview is
directly translated on-screen without another onDraw recording on the UI
thread. The comparison in BVR::OnParentDrawConstraintsUpdated is
supposed to catch this case and cause another invalidate.

This CL refers to internal bug b/117560442

Change-Id: Ic03f91631780a2057931cb39cdecd04d32f52b1d
Reviewed-on: https://chromium-review.googlesource.com/c/1295315
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604297}