Merge 175820

Merge 175820
> android: Pass CPU properties from browser to renderer process.
> 
> This is necessary to allow the renderer processes to use NEON
> instructions on ARM devices that support them in libraries like
> Skia.
> 
> The main issue is that on JellyBean and higher, the renderer
> process runs in a sandbox that prevents it from accessing the
> filesystem, including /proc/ which is the only way to query the
> kernel for the features detected by the CPU.
> 
> To overcome this, send the result of the probe to each renderer
> process, which will use the new android_setCpu() function
> introduced in https://gerrit.chromium.org/gerrit/#/c/39370/
> 
> Note that this requires that third-party libraries use the
> android_getCpuCount() and android_getCpuFeatures() function
> to get this data at runtime.
> 
> BUG=164154
> NOTRY=true
> 
> Review URL: https://chromiumcodereview.appspot.com/11503013

TBR=digit@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=177679