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When entering presentation mode from 2D browsing, the content's buffer
size is not set, and thus VrShellGl uses the wrong buffer size for the
dialogs.

Bug: 856727
Change-Id: Idf740285739e026a818b44c85fd05b34edfbd17f
Reviewed-on: https://chromium-review.googlesource.com/1124864Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572271}