create and thread batch tracker object

src/gpu/GrOptDrawState.cpp

Index: src/gpu/GrOptDrawState.cpp
diff --git a/src/gpu/GrOptDrawState.cpp b/src/gpu/GrOptDrawState.cpp
index 41a34c4ed2d885bedb7653d1152704e4cf3dd8bf..6fc3bc72aadcafd23e37a4df945a4ffb6095d74f 100644
--- a/src/gpu/GrOptDrawState.cpp
+++ b/src/gpu/GrOptDrawState.cpp
@@ -117,6 +117,16 @@ GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
 
     // now create a key
     gpu->buildProgramDesc(*this, descInfo, drawType, &fDesc);
+
+    // let the GP init the batch tracker
+    if (drawState.hasGeometryProcessor()) {
+        GrGeometryProcessor::InitBT init;
+        init.fOutputColor = descInfo.fInputColorIsUsed;
+        init.fOutputCoverage = descInfo.fInputCoverageIsUsed;
+        init.fColor = this->getColor();
+        init.fCoverage = this->getCoverage();
+        fGeometryProcessor->initBatchTracker(&fBatchTracker, init);
+    }
 };
 
 void GrOptDrawState::setOutputStateInfo(const GrDrawState& ds,