Fix CodecSubset benches seg faults for kIndex8

bench/subset/SubsetBenchPriv.h

Index: bench/subset/SubsetBenchPriv.h
diff --git a/bench/subset/SubsetBenchPriv.h b/bench/subset/SubsetBenchPriv.h
index e0eb2ff82676dde1a6401fd948ecbd1a793a35ab..6bd2b7c058c7ad9b408e249a98ffaf4792845581 100644
--- a/bench/subset/SubsetBenchPriv.h
+++ b/bench/subset/SubsetBenchPriv.h
@@ -32,4 +32,14 @@ static const char* get_color_name(SkColorType colorType) {
     }
 }
 
+static inline void alloc_pixels(SkBitmap* bitmap, const SkImageInfo& info, SkColorType colorType,
+        SkPMColor* colors, int colorCount) {
+    if (kIndex_8_SkColorType == colorType) {

[scroggo, 2015/06/30 19:12:00]

Does colorType need to be a separate parameter? It seems like you could get it
from info? (If not, it seems like we're doing the wrong thing, since info needs
to be Index8 to use the colortable.)

[msarett, 2015/06/30 19:36:00]

Agreed!

+        SkAutoTUnref<SkColorTable> colorTable(SkNEW_ARGS(SkColorTable, (colors, colorCount)));
+        bitmap->allocPixels(info, NULL, colorTable);
+    } else {
+        bitmap->allocPixels(info);
+    }
+}
+
 #endif // SubsetBenchPriv_DEFINED