Merge 168106

Merge 168106
> Reduce high latency input buffers to 1.
> 
> Multiple buffers lead to trampling input data which is in the process
> of being transmitted across the shared memory.
> 
> Since this API was never intended for low latency usage, clients should
> instead use a larger buffer size. At least 2048 @ 44.1kHz (Flash) and
> 1600 at 16kHz (speech recognizer).
> 
> vtl will land a fix to flash along side this change to move it off of the
> RecommendSampleCount() method to a hard coded 2048 frame buffer.
> 
> NOTRY=true
> BUG=157613
> TEST=input is clear and crisp w/ flash @ 2048 buffer.
> 
> Review URL: https://codereview.chromium.org/11418017

TBR=dalecurtis@google.com
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=170808