Merge 187732 "Don't use magic statics in SincResampler for threa..."

Merge 187732 "Don't use magic statics in SincResampler for threa..."

> Don't use magic statics in SincResampler for thread safe init.
> 
> SincResampler uses magic statics for thread safe initialization
> of runtime detected SIMD support functions.  Sadly, this is not
> supported on MSVC++ until VS2012.
> 
> Crash reports seem to indicate that every once in a while this
> fails on Windows and kConvolveProc ends up initialized to NULL.
> 
> This patch moves initializtion from once per renderer to once
> per SincResampler construction.  Not ideal, but there should
> never be very many instantiations of this class.  Long term
> we'll be moving to an SSE baseline which obviates the runtime
> selection process.
> 
> BUG=179986
> TEST=media_unittests
> 
> 
> Review URL: https://chromiumcodereview.appspot.com/12530005

TBR=dalecurtis@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=188226

[DaleCurtis, 2013-03-14 22:53:05]

Committed patchset #1 manually as r188226.