SkColorTable locking serves no purpose anymore.

src/images/SkImageDecoder_libwebp.cpp

Index: src/images/SkImageDecoder_libwebp.cpp
diff --git a/src/images/SkImageDecoder_libwebp.cpp b/src/images/SkImageDecoder_libwebp.cpp
index 8bf15c92e6235b52751a444aac5ecf6a898f14e2..2a7bb0fe59189d6ddccc795ec30e4ff6a0330d8f 100644
--- a/src/images/SkImageDecoder_libwebp.cpp
+++ b/src/images/SkImageDecoder_libwebp.cpp
@@ -621,7 +621,6 @@ bool SkWEBPImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bm,
     }
 
     SkAutoLockPixels alp(bm);
-    SkAutoLockColors ctLocker;
     if (NULL == bm.getPixels()) {
         return false;
     }
@@ -638,7 +637,7 @@ bool SkWEBPImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bm,
     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;