SkColorTable locking serves no purpose anymore.

src/images/SkImageEncoder_argb.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 "SkImageEncoder.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 80 matching lines @@
     if (NULL == scanline_import) {
         return false;
     }
 
     SkAutoLockPixels alp(bitmap);
     const uint8_t* src = (uint8_t*)bitmap.getPixels();
     if (NULL == bitmap.getPixels()) {
         return false;
     }
 
-    SkAutoLockColors ctLocker;
-    const SkPMColor* colors = ctLocker.lockColors(bitmap);
+    const SkPMColor* colors = bitmap.getColorTable() ? bitmap.getColorTable()->readColors() : NULL;
 
     const int argbStride = bitmap.width() * 4;
     SkAutoTDeleteArray<uint8_t> ada(new uint8_t[argbStride]);
     uint8_t* argb = ada.get();
     for (int y = 0; y < bitmap.height(); ++y) {
         scanline_import(src + y * bitmap.rowBytes(), argb, bitmap.width(), colors);
         stream->write(argb, argbStride);
     }
 
     return true;
 }
 
 
 ///////////////////////////////////////////////////////////////////////////////
 DEFINE_ENCODER_CREATOR(ARGBImageEncoder);
 ///////////////////////////////////////////////////////////////////////////////