.setDownsampleEnabled(true) then resize don't work for webp with at least Android API =17

Hello,

Testing Fresco with .setDownsampleEnabled(true) on one API 17 device, I don't have the downsample fresco logs (RequestLoggingListener).

With another device, that is API 10, files are well downsampled. I could see the RequestLoggingListener lines.

The API 10 device, with same Fresco settings (downsample and resize to same size) is fastest (about x2 to x4 ) to decode picture that the API 17 one.

API 10 :
`RequestLoggingListener: time 210302582: onProducerFinishWithSuccess: {requestId: 11, producer: DecodeProducer, elapsedTime: 273 ms, extraMap: {bitmapSize=1600x1067, queueTime=0, imageType=DEFAULT, isFinal=true, hasGoodQuality=true}}`

API 17 :
`RequestLoggingListener: time 89545018: onProducerFinishWithSuccess: {requestId: 52, producer: DecodeProducer, elapsedTime: 928 ms, extraMap: {bitmapSize=1600x1067, queueTime=2, imageType=DEFAULT, isFinal=true, hasGoodQuality=true}}`

On API 10, I can find the Downsample log line :
`DownsampleUtil: Downsample - Specified size: 2048x2048, image size: 1600x1067 ratio: 1.3 x 1.9, ratio: 1.919 for http://domain.tl/picture.jpg`

Thus I can't in API 17.

I have read this (http://frescolib.org/docs/configure-image-pipeline.html#_) and see downsample is experimental, but which Android version are supported, and which are not ?

This have been tested with fresco 0.10.0, 0.11.0.
All tested pictures are prefetch to disk and stored there before to be displayed.

Greatings,

Eric