Fix png encoding in skia debugger

tools/debugger/SkDrawCommand.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SKDRAWCOMMAND_H_
 #define SKDRAWCOMMAND_H_
 
@@ skipping 42 matching lines @@
         kSave_OpType,
         kSaveLayer_OpType,
         kSetMatrix_OpType,
 
         kLast_OpType = kSetMatrix_OpType
     };
 
     static const int kOpTypeCount = kLast_OpType + 1;
 
     static void WritePNG(const png_bytep rgba, png_uint_32 width, png_uint_32 height,
-                         SkWStream& out);
+                         SkWStream& out, bool isOpaque);
 
     SkDrawCommand(OpType opType);
 
     virtual ~SkDrawCommand();
 
     virtual SkString toString() const;
 
     virtual const char* toCString() const {
         return GetCommandString(fOpType);
     }
@@ skipping 613 matching lines @@
     static SkSetMatrixCommand* fromJSON(Json::Value& command, UrlDataManager& urlDataManager);
 
 private:
     SkMatrix fUserMatrix;
     SkMatrix fMatrix;
 
     typedef SkDrawCommand INHERITED;
 };
 
 #endif