Revert "Remove Android-specific SK_SUPPORT_LEGACY_IMG_SNAPSHOT flag"

This reverts commit c3efe6785666cdd13848e63f36fdadca26c48649.

Reason for revert: RenderNodeDrawableTests.cpp

Original change's description:
> Remove Android-specific SK_SUPPORT_LEGACY_IMG_SNAPSHOT flag
> 
> Android has been updated to use the new signature so this should no longer be needed
> 
> Change-Id: Id745191e815381d032aba6a49bf4baf9c53b2385
> Reviewed-on: https://skia-review.googlesource.com/9985
> Reviewed-by: Derek Sollenberger <djsollen@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> 

TBR=djsollen@google.com,robertphillips@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I0211342b237373fe40d205bb18bbef5efce56bf3
Reviewed-on: https://skia-review.googlesource.com/9946
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed