Allow printf-style formatting to be used in SK_ABORT.

SK_ABORT was already using SkDebugf to print the error message to the
console, so all the moving parts were there. This CL just adds a
mechanism for the calling code to pass in arguments.

Added a use case to demonstrate usage--when an allocation fails, the
requested size is now shown in the error message.

Change-Id: I42f141151fb57a399c086926249816833f349ddb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/293272
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Herb Derby <herb@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
6 files changed