Make SkImage_Lazy cache its result from onMakeColorSpace

May sites will all onMakeColorSpace every frame, resulting repeatedly
re-created new SkImage_Lazy class instances, new cache keys, and
repeated cache misses.

Save the most recent result from onMakeColorSpace, to avoid this thrash.

Bug:741607
Change-Id: I34091327a17275722f82ed372eb0b341806a9ddc
Reviewed-on: https://skia-review.googlesource.com/23287
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed