Make GrGpuResources register with GrResourceCache2 after fully constructed.

Committed: https://skia.googlesource.com/skia/+/d68b3e491bb765beb7ca5e4ac8e0c80dedf5a83b

R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/504313002
diff --git a/tests/ResourceCacheTest.cpp b/tests/ResourceCacheTest.cpp
index 4b43d4f..ae140e2 100644
--- a/tests/ResourceCacheTest.cpp
+++ b/tests/ResourceCacheTest.cpp
@@ -69,6 +69,7 @@
         , fToDelete(NULL)
         , fSize(size) {
         ++fAlive;
+        this->registerWithCache();
     }
 
     ~TestResource() {