add new copyTo version to SkBitmap, which takes SkColorType

tools/CopyTilesRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "picture_utils.h"
 #include "CopyTilesRenderer.h"
 #include "SkCanvas.h"
@@ skipping 52 matching lines @@
                             // Similar to writeAppendNumber in PictureRenderer.cpp, but just encodes
                             // a bitmap directly.
                             SkString pathWithNumber(*path);
                             pathWithNumber.appendf("%i.png", i++);
                             SkBitmap copy;
 #if SK_SUPPORT_GPU
                             if (isUsingGpuDevice()) {
                                 dst.pixelRef()->readPixels(&copy, &subset);
                             } else {
 #endif
-                                dst.copyTo(&copy, dst.config());
+                                dst.copyTo(&copy);
 #if SK_SUPPORT_GPU
                             }
 #endif
                             success &= SkImageEncoder::EncodeFile(pathWithNumber.c_str(), copy,
                                                                   SkImageEncoder::kPNG_Type, 100);
                         }
                     }
                 }
             }
         }
         return success;
     }
 
     SkString CopyTilesRenderer::getConfigNameInternal() {
         return SkString("copy_tiles");
     }
 }