Fix CodecSubset benches seg faults for kIndex8

bench/subset/SubsetBenchPriv.h

 /*
  * Copyright 2015 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SubsetBenchPriv_DEFINED
 #define SubsetBenchPriv_DEFINED
 
@@ skipping 14 matching lines @@
             return "Gray8";
         case kIndex_8_SkColorType:
             return "Index8";
         case kAlpha_8_SkColorType:
             return "Alpha8";
         default:
             return "Unknown";
     }
 }
 
+/*
+ * If we plan to decode to kIndex8, we must create a color table and pass it to the
+ * bitmap when we allocate pixels.  Otherwise, we simply allocate pixels using the
+ * decode info.
+ */
+static inline void alloc_pixels(SkBitmap* bitmap, const SkImageInfo& info, SkPMColor* colors,
+        int colorCount) {
+    if (kIndex_8_SkColorType == info.colorType()) {
+        SkAutoTUnref<SkColorTable> colorTable(SkNEW_ARGS(SkColorTable, (colors, colorCount)));
+        bitmap->allocPixels(info, NULL, colorTable);
+    } else {
+        bitmap->allocPixels(info);
+    }
+}
+
 #endif // SubsetBenchPriv_DEFINED