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Since blob stream needs higher resolution, it causes higher cpu loading
to require higher resolution and resize to smaller resolution.
In hangout app, we don't need blob stream. Enabling blob stream when
needed can save a lot of cpu usage.

BUG=b:114676133
TEST=manually test in apprtc and CCA. make sure picture taking still
works in CCA.

Change-Id: I9144461bc76627903d0b3b359ce9cf962ff3628c
Reviewed-on: https://chromium-review.googlesource.com/c/1261242
Commit-Queue: Heng-ruey Hsu <henryhsu@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601492}