Force filmstrip images to generate in JPEG compression format

Due to https://github.com/bumptech/glide/issues/156, we sometimes
were getting PNG cache image generation which greatly increased
latency and introduced jank. As workaround, explicitly forcing
images to utilize JPEG format.

Bug: 17597861
Change-Id: I49d7266d4ff0173d253877612b3076489a6b385a
1 file changed