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This is achieved by setting the correct FBO before each kModeDraw and
hardware renderer won't reset it at the end of the draw so that
kModeProcess between kModeDraws also has the correct FBO.

This CL is to solve a bug where kModeProcess could run some GL commands
that binds the wrong FBO, and the following kModeDraw is messed up.

BUG=527113

Review URL: https://codereview.chromium.org/1335033004

Cr-Commit-Position: refs/heads/master@{#348766}