Add debug helper for finding leaks in GrMemoryPool.h

Change-Id: I1d11769f9e99606af5e7752b3a6d055a5bf6a48d
Reviewed-on: https://skia-review.googlesource.com/10289
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed