Add debugging helper to GrDrawTarget

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 52 matching lines @@
      */
     void addDependency(GrSurface* dependedOn);
 
     /*
      * Does this drawTarget depend on 'dependedOn'?
      */
     bool dependsOn(GrDrawTarget* dependedOn) const {
         return fDependencies.find(dependedOn) >= 0;
     }
 
+    /*
+     * Dump out the drawTarget dependency DAG
+     */
+    SkDEBUGCODE(void dump() const;)
+
     /**
      * Empties the draw buffer of any queued up draws.
      */
     void reset();
 
     /**
      * This plays any queued up draws to its GrGpu target. It also resets this object (i.e. flushing
      * is destructive).
      */
     void flush();
@@ skipping 214 matching lines @@
     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;
 
     // 'this' drawTarget relies on the output of the drawTargets in 'fDependencies'
     SkTDArray<GrDrawTarget*>                    fDependencies;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif