Specify bit depth and color space in SkImage::MakeFromPicture()

BUG=skia:

Change-Id: I1d2a2b1f97557fc3e7ca6c2bdad6329f7760dbd2
Reviewed-on: https://skia-review.googlesource.com/6685
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/gm/image_shader.cpp b/gm/image_shader.cpp
index 7803739..522d373 100644
--- a/gm/image_shader.cpp
+++ b/gm/image_shader.cpp
@@ -48,6 +48,7 @@
 
 static sk_sp<SkImage> make_pict_gen(GrContext*, SkPicture* pic, const SkImageInfo& info) {
     return SkImage::MakeFromPicture(sk_ref_sp(pic), info.dimensions(), nullptr, nullptr,
+                                    SkImage::BitDepth::kU8,
                                     SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named));
 }