SkDiscardablePixelRef returns correct indexed color on relock.

tests/ImageDecodingTest.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 "Resources.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 705 matching lines @@
                     }
                     SkDecodingImageGenerator::Options options(scaleList[i],
                                                               ditherList[j]);
                     test_options(reporter, options, encodedStream, encodedData,
                                  useDataList[m], path);
                 }
             }
         }
     }
 }
+
+DEF_TEST(DiscardablePixelRef_SecondLockColorTableCheck, r) {
+    SkString resourceDir = GetResourcePath();
+    SkString path = SkOSPath::SkPathJoin(resourceDir.c_str(), "randPixels.gif");
+    if (!sk_exists(path.c_str())) {
+        return;
+    }
+    SkAutoDataUnref encoded(SkData::NewFromFileName(path.c_str()));
+    SkBitmap bitmap;
+    if (!SkInstallDiscardablePixelRef(
+            SkDecodingImageGenerator::Create(
+                    encoded, SkDecodingImageGenerator::Options()), &bitmap)) {
+        ERRORF(r, "SkInstallDiscardablePixelRef [randPixels.gif] failed.");
+        return;
+    }
+    {
+        SkAutoLockPixels alp(bitmap);
+        REPORTER_ASSERT(r, bitmap.getColorTable() && "first pass");
+    }
+    {
+        SkAutoLockPixels alp(bitmap);
+        REPORTER_ASSERT(r, bitmap.getColorTable() && "second pass");
+    }
+}