SkDiscardablePixelRef returns correct indexed color on relock.

src/lazy/SkDiscardablePixelRef.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 "SkDiscardablePixelRef.h"
 #include "SkDiscardableMemory.h"
 #include "SkImageGenerator.h"
@@ skipping 22 matching lines @@
     }
     SkDELETE(fDiscardableMemory);
     SkSafeUnref(fDMFactory);
     SkDELETE(fGenerator);
 }
 
 bool SkDiscardablePixelRef::onNewLockPixels(LockRec* rec) {
     if (fDiscardableMemory != NULL) {
         if (fDiscardableMemory->lock()) {
             rec->fPixels = fDiscardableMemory->data();
-            rec->fColorTable = NULL;
+            rec->fColorTable = fCTable.get();
             rec->fRowBytes = fRowBytes;
             return true;
         }
         SkDELETE(fDiscardableMemory);
         fDiscardableMemory = NULL;
     }
 
     const size_t size = this->info().getSafeSize(fRowBytes);
 
     if (fDMFactory != NULL) {
@@ skipping 59 matching lines @@
         SkNEW_ARGS(SkDiscardablePixelRef,
                    (info, autoGenerator.detach(), dst->rowBytes(), factory)));
     dst->setPixelRef(ref);
     return true;
 }
 
 // This is the public API
 bool SkInstallDiscardablePixelRef(SkImageGenerator* generator, SkBitmap* dst) {
     return SkInstallDiscardablePixelRef(generator, dst, NULL);
 }