Move SkImage::encode to SkImageEncoder

tools/skpdiff/SkDiffContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkImageDecoder.h"
+#include "SkImageEncoder.h"
 #include "SkOSFile.h"
 #include "SkRunnable.h"
 #include "SkSize.h"
 #include "SkStream.h"
 #include "SkTDict.h"
 #include "SkTaskGroup.h"
 
 // from the tools directory for replace_char(...)
 #include "picture_utils.h"
 
@@ skipping 432 matching lines @@
         for (int i = 0; i < cntColumns; i++) {
             SkString str;
             str.printf(", %f", values[i]);
             stream.writeText(str.c_str());
         }
         stream.writeText("\n");
 
         currentRecord = iter2.next();
     }
 }