Fix CodecSubset benches seg faults for kIndex8

bench/subset/SubsetSingleBench.cpp

Index: bench/subset/SubsetSingleBench.cpp
diff --git a/bench/subset/SubsetSingleBench.cpp b/bench/subset/SubsetSingleBench.cpp
index 68c94cd246b125a27ba26e6bec7a2f6409006bb4..2bddbdcc23aa85027f1c67459b3b5c2f7f6271b5 100644
--- a/bench/subset/SubsetSingleBench.cpp
+++ b/bench/subset/SubsetSingleBench.cpp
@@ -59,7 +59,7 @@ bool SubsetSingleBench::isSuitableFor(Backend backend) {
 void SubsetSingleBench::onDraw(const int n, SkCanvas* canvas) {
     // When the color type is kIndex8, we will need to store the color table.  If it is
     // used, it will be initialized by the codec.
-    int colorCount;
+    int colorCount = 0;
     SkPMColor colors[256];
     if (fUseCodec) {
         for (int count = 0; count < n; count++) {
@@ -70,7 +70,8 @@ void SubsetSingleBench::onDraw(const int n, SkCanvas* canvas) {
                     info, NULL, colors, &colorCount);
 
             SkBitmap bitmap;
-            bitmap.allocPixels(info.makeWH(fSubsetWidth, fSubsetHeight));
+            bitmap.allocPixels(info.makeWH(fSubsetWidth, fSubsetHeight), NULL,
+                    SkNEW_ARGS(SkColorTable, (colors, colorCount)));
 
             scanlineDecoder->skipScanlines(fOffsetTop);
             uint32_t bpp = info.bytesPerPixel();