added a default constructor for GrBatchToXPOverrides

src/gpu/GrPipeline.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPipeline_DEFINED
 #define GrPipeline_DEFINED
 
 #include "GrColor.h"
 #include "GrFragmentProcessor.h"
 #include "GrGpu.h"
 #include "GrNonAtomicRef.h"
 #include "GrPendingProgramElement.h"
 #include "GrPrimitiveProcessor.h"
 #include "GrProgramDesc.h"
 #include "GrStencil.h"
 #include "GrTypesPriv.h"
 #include "SkMatrix.h"
 #include "SkRefCnt.h"
 
 class GrBatch;
 class GrDeviceCoordTexture;
 class GrPipelineBuilder;
 
 struct GrBatchToXPOverrides {
+    GrBatchToXPOverrides()
+    : fUsePLSDstRead(false) {}
+
     bool fUsePLSDstRead;
 };
 
 struct GrPipelineOptimizations {
     GrProcOptInfo fColorPOI;
     GrProcOptInfo fCoveragePOI;
     GrBatchToXPOverrides fOverrides;
 };
 
 /**
@@ skipping 162 matching lines @@
     bool                                fReadsFragPosition;
     bool                                fIgnoresCoverage;
 
     // This value is also the index in fFragmentProcessors where coverage processors begin.
     int                                 fNumColorProcessors;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif