use new/delete to manage GrOp Memory

Change-Id: Idb2dcad48973cabe7ea8ac34ed57dc2fca176f9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462037Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Herb Derby <herb@google.com>
Cr-Commit-Position: refs/heads/master@{#815222}

skia/config/SkUserConfig.h

@@ -225,6 +225,10 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define SK_SUPPORT_LEGACY_AAA_CHOICE
 #endif
 
+#ifndef GR_OP_ALLOCATE_USE_NEW
+#define GR_OP_ALLOCATE_USE_NEW
+#endif
+
 // Staging for lowp::bilerp_clamp_8888, and for planned misc. others.
 #define SK_DISABLE_LOWP_BILERP_CLAMP_CLAMP_STAGE