Update VP8 encode options to speed up encoding for remoting
Update VP8 encode options to speed up encoding for remoting

More details changes made in this patch:
g_profile: 1 -> 2
  Will use a more simplified profile similar to H264 base profile
g_threads: 1 -> 2
  Use 2 threads for encoding, it was always intended to do this but disabled before due to a bug in libvpx
cpuused: 13->16
  Disable half pixel motion vector and use simple loop filtering

Quality for static pictures will stay roughly the same but encoding time will be halved for the most common scenario. Quality of motion picture will suffer with this patch, but not by a large factor due to the fact that we were using real time encoding mode already. So This really trims the parts that we don't need.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/7084013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@89743 0039d316-1c4b-4281-b951-d872f2087c98

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