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Previously texture resource sync points were waited on
a just-in-time basis, just before drawing with the texture.

This change moves all sync point waits ahead of drawing a
frame, to ensure that we don't switch GLContexts in the
middle of drawing.

BUG=394547

Review URL: https://codereview.chromium.org/411643002

Cr-Commit-Position: refs/heads/master@{#290109}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290109 0039d316-1c4b-4281-b951-d872f2087c98