Revert "change SkColorTable to be immutable"

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 
 /*  Fill out buffer with the compressed format Ganesh expects from a colortable
@@ skipping 13 matching lines @@
     SkAutoLockPixels alp(bitmap);
     if (!bitmap.readyToDraw()) {
         SkDEBUGFAIL("bitmap not ready to draw!");
         return;
     }
 
     SkColorTable* ctable = bitmap.getColorTable();
     char* dst = (char*)buffer;
 
     memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
-    ctable->unlockColors();
+    ctable->unlockColors(false);
 
     // always skip a full 256 number of entries, even if we memcpy'd fewer
     dst += kGrColorTableSize;
 
     if ((unsigned)bitmap.width() == bitmap.rowBytes()) {
         memcpy(dst, bitmap.getPixels(), bitmap.getSize());
     } else {
         // need to trim off the extra bytes per row
         size_t width = bitmap.width();
         size_t rowBytes = bitmap.rowBytes();
@@ skipping 162 matching lines @@
             return kRGB_565_GrPixelConfig;
         case SkBitmap::kARGB_4444_Config:
             return kRGBA_4444_GrPixelConfig;
         case SkBitmap::kARGB_8888_Config:
             return kSkia8888_GrPixelConfig;
         default:
             // kNo_Config, kA1_Config missing
             return kUnknown_GrPixelConfig;
     }
 }