SkColorTable locking serves no purpose anymore.

src/images/SkImageDecoder_libwebp.cpp

 /*
  * Copyright 2010, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ skipping 603 matching lines @@
     int bpp = -1;
     const ScanlineImporter scanline_import = ChooseImporter(bm.colorType(), hasAlpha, &bpp);
     if (NULL == scanline_import) {
         return false;
     }
     if (-1 == bpp) {
         return false;
     }
 
     SkAutoLockPixels alp(bm);
-    SkAutoLockColors ctLocker;
     if (NULL == bm.getPixels()) {
         return false;
     }
 
     WebPConfig webp_config;
     if (!WebPConfigPreset(&webp_config, WEBP_PRESET_DEFAULT, (float) quality)) {
         return false;
     }
 
     WebPPicture pic;
     WebPPictureInit(&pic);
     pic.width = bm.width();
     pic.height = bm.height();
     pic.writer = stream_writer;
     pic.custom_ptr = (void*)stream;
 
-    const SkPMColor* colors = ctLocker.lockColors(bm);
+    const SkPMColor* colors = bm.getColorTable() ? bm.getColorTable()->readColors() : NULL;
     const uint8_t* src = (uint8_t*)bm.getPixels();
     const int rgbStride = pic.width * bpp;
 
     // Import (for each scanline) the bit-map image (in appropriate color-space)
     // to RGB color space.
     uint8_t* rgb = new uint8_t[rgbStride * pic.height];
     for (int y = 0; y < pic.height; ++y) {
         scanline_import(src + y * bm.rowBytes(), rgb + y * rgbStride,
                         pic.width, colors);
     }
@@ skipping 36 matching lines @@
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageEncoder* sk_libwebp_efactory(SkImageEncoder::Type t) {
       return (SkImageEncoder::kWEBP_Type == t) ? SkNEW(SkWEBPImageEncoder) : NULL;
 }
 
 static SkImageDecoder_DecodeReg gDReg(sk_libwebp_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_webp);
 static SkImageEncoder_EncodeReg gEReg(sk_libwebp_efactory);