Replace EncodeBitmap with an interface.

gm/gmmain.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * Code for the "gm" (Golden Master) rendering comparison tool.
  *
@@ skipping 1021 matching lines @@
         }
         SkPictureRecorder recorder;
         SkCanvas* cv = recorder.beginRecording(width, height, factory.get(), recordFlags);
         cv->scale(scale, scale);
         invokeGM(gm, cv, false, false);
         return recorder.endRecording();
     }
 
     static SkPicture* stream_to_new_picture(const SkPicture& src) {
         SkDynamicMemoryWStream storage;
-        src.serialize(&storage, NULL);
+        src.serialize(&storage);
         SkAutoTUnref<SkStreamAsset> pictReadback(storage.detachAsStream());
         SkPicture* retval = SkPicture::CreateFromStream(pictReadback,
                                                         &SkImageDecoder::DecodeMemory);
         return retval;
     }
 
     // Test: draw into a bitmap or pdf.
     // Depending on flags, possibly compare to an expected image.
     // If writePath is not NULL, also write images (or documents) to the specified path.
     ErrorCombination test_drawing(GM* gm, const ConfigData& gRec,
@@ skipping 1437 matching lines @@
     if (FLAGS_forceBWtext) {
         canvas->setDrawFilter(SkNEW(BWTextDrawFilter))->unref();
     }
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif