Disable preemptive batch preparation

src/gpu/GrDrawTarget.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawTarget_DEFINED
 #define GrDrawTarget_DEFINED
 
@@ skipping 18 matching lines @@
 #include "SkStringUtils.h"
 #include "SkStrokeRec.h"
 #include "SkTArray.h"
 #include "SkTLazy.h"
 #include "SkTypes.h"
 #include "SkXfermode.h"
 
 //#define ENABLE_MDB 1
 
 class GrBatch;
-class GrBatchFlushState;
 class GrClip;
 class GrCaps;
 class GrPath;
 class GrDrawPathBatchBase;
 class GrPathRangeDraw;
 
 class GrDrawTarget final : public SkRefCnt {
 public:
     struct Options {
         bool fImmediateMode;
@@ skipping 257 matching lines @@
     void clearStencilClip(const SkIRect&, bool insideClip, GrRenderTarget*);
 
     SkSTArray<256, SkAutoTUnref<GrBatch>, true> fBatches;
     SkAutoTDelete<GrClipMaskManager>            fClipMaskManager;
     // The context is only in service of the clip mask manager, remove once CMM doesn't need this.
     GrContext*                                  fContext;
     GrGpu*                                      fGpu;
     GrResourceProvider*                         fResourceProvider;
     GrBatchFlushState                           fFlushState;
     bool                                        fFlushing;
-    int                                         fFirstUnpreparedBatch;
 
     SkDEBUGCODE(int                             fDebugID;)
     uint32_t                                    fFlags;
     Options                                     fOptions;
 
     // 'this' drawTarget relies on the output of the drawTargets in 'fDependencies'
     SkTDArray<GrDrawTarget*>                    fDependencies;
     GrRenderTarget*                             fRenderTarget;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif