Increase the amount of debug information printed out by batches

src/gpu/batches/GrDiscardBatch.h

Index: src/gpu/batches/GrDiscardBatch.h
diff --git a/src/gpu/batches/GrDiscardBatch.h b/src/gpu/batches/GrDiscardBatch.h
index c13e7327d7fbf6930e0983f5537c99c7fc59ecea..aa443cf60341041c859862e4a1c816324710debe 100644
--- a/src/gpu/batches/GrDiscardBatch.h
+++ b/src/gpu/batches/GrDiscardBatch.h
@@ -29,7 +29,7 @@ public:
 
     SkString dumpInfo() const override {
         SkString string;
-        string.printf("RT: 0x%p", fRenderTarget.get());
+        string.printf("RT: %d", fRenderTarget.get()->getUniqueID());
         return string;
     }