Lazy init batch unique ID

src/gpu/batches/GrBatch.cpp

Index: src/gpu/batches/GrBatch.cpp
diff --git a/src/gpu/batches/GrBatch.cpp b/src/gpu/batches/GrBatch.cpp
index 8af1c1e0880ddd0673cbeeb1adf628c25c47b69f..900f889ff870f759ba09ab7dbf1d7c26d527ef42 100644
--- a/src/gpu/batches/GrBatch.cpp
+++ b/src/gpu/batches/GrBatch.cpp
@@ -36,7 +36,7 @@ public:
 
 int32_t GrBatch::gCurrBatchClassID = GrBatch::kIllegalBatchID;
 
-GrBATCH_SPEW(int32_t GrBatch::gCurrBatchUniqueID = GrBatch::kIllegalBatchID;)
+int32_t GrBatch::gCurrBatchUniqueID = GrBatch::kIllegalBatchID;
 
 void* GrBatch::operator new(size_t size) {
     return MemoryPoolAccessor().pool()->allocate(size);
@@ -48,10 +48,7 @@ void GrBatch::operator delete(void* target) {
 
 GrBatch::GrBatch(uint32_t classID)
     : fClassID(classID)
-#if GR_BATCH_SPEW
-    , fUniqueID(GenBatchID())
-#endif
-{
+    , fUniqueID(kIllegalBatchID) {
     SkDEBUGCODE(fUsed = false;)
 }