Start using GrGpuCommandBuffer in GrDrawTarget.

src/gpu/batches/GrVertexBatch.cpp

Index: src/gpu/batches/GrVertexBatch.cpp
diff --git a/src/gpu/batches/GrVertexBatch.cpp b/src/gpu/batches/GrVertexBatch.cpp
index 8a5dd6289bb30ad7427ea4b8ff5671ed3cfbb981..af3a186e1353aecf6e85041e72b6e852e98f7026 100644
--- a/src/gpu/batches/GrVertexBatch.cpp
+++ b/src/gpu/batches/GrVertexBatch.cpp
@@ -75,8 +75,8 @@ void GrVertexBatch::onDraw(GrBatchFlushState* state) {
             state->doUpload(fInlineUploads[currUploadIdx++].fUpload);
         }
         const QueuedDraw &draw = fQueuedDraws[currDrawIdx];
-        state->gpu()->draw(*this->pipeline(), *draw.fGeometryProcessor.get(),
-                           fMeshes.begin() + currMeshIdx, draw.fMeshCnt);
+        state->commandBuffer()->draw(*this->pipeline(), *draw.fGeometryProcessor.get(),
+                                     fMeshes.begin() + currMeshIdx, draw.fMeshCnt);
         currMeshIdx += draw.fMeshCnt;
         state->flushToken();
     }