Add abilitly to query audit trail for batches by draw op

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1745513002

Committed: https://skia.googlesource.com/skia/+/9b48a6e3f862076018cc7d63b180b6340f4873cd

Review URL: https://codereview.chromium.org/1745513002
diff --git a/tools/skiaserve/Request.h b/tools/skiaserve/Request.h
index fd015dc..60a59a7 100644
--- a/tools/skiaserve/Request.h
+++ b/tools/skiaserve/Request.h
@@ -60,6 +60,8 @@
     void drawToCanvas(int n);
     SkSurface* createCPUSurface();
     SkSurface* createGPUSurface();
+    GrAuditTrail* getAuditTrail(SkCanvas*);
+    void cleanupAuditTrail(SkCanvas*);
     
     SkAutoTUnref<SkPicture> fPicture;
     SkAutoTDelete<GrContextFactory> fContextFactory;