If decoder doesn't ouput indexed color, don't check colortable

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 720 matching lines @@
         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;
     }
+    if (kIndex_8_SkColorType != bitmap.colorType()) {
+        return;
+    }
     {
         SkAutoLockPixels alp(bitmap);
         REPORTER_ASSERT(r, bitmap.getColorTable() && "first pass");
     }
     {
         SkAutoLockPixels alp(bitmap);
         REPORTER_ASSERT(r, bitmap.getColorTable() && "second pass");
     }
 }