fix for msan

src/gpu/GrBatchTarget.h

Index: src/gpu/GrBatchTarget.h
diff --git a/src/gpu/GrBatchTarget.h b/src/gpu/GrBatchTarget.h
index 51dd8cac8941db6979bab5825f13765366e435ac..ae046c1ee1e2cb44e406d1603187682d9e3330c7 100644
--- a/src/gpu/GrBatchTarget.h
+++ b/src/gpu/GrBatchTarget.h
@@ -8,6 +8,7 @@
 #ifndef GrBatchBuffer_DEFINED
 #define GrBatchBuffer_DEFINED
 
+#include "GrBufferAllocPool.h"
 #include "GrPendingProgramElement.h"
 #include "GrPipeline.h"
 #include "GrGpu.h"
@@ -82,6 +83,13 @@ public:
 
     const GrIndexBuffer* quadIndexBuffer() const { return fGpu->getQuadIndexBuffer(); }
 
+    // A helper for draws which overallocate and then return data to the pool
+    void putBackIndices(size_t indices) { fIndexPool->putBack(indices * sizeof(uint16_t)); }
+
+    void putBackVertices(size_t vertices, size_t vertexStride) {
+        fVertexPool->putBack(vertices * vertexStride);
+    }
+
 private:
     GrGpu* fGpu;
     GrVertexBufferAllocPool* fVertexPool;