Hide fields in SkImageInfo

R=rmistry@google.com
TBR=bsalomon

Author: reed@google.com

Review URL: https://codereview.chromium.org/536003002
diff --git a/bench/WritePixelsBench.cpp b/bench/WritePixelsBench.cpp
index 5138375..88b2e62 100644
--- a/bench/WritePixelsBench.cpp
+++ b/bench/WritePixelsBench.cpp
@@ -54,9 +54,7 @@
         bmp.allocN32Pixels(size.width(), size.height());
         canvas->readPixels(&bmp, 0, 0);
 
-        SkImageInfo info = bmp.info();
-        info.fColorType = fColorType;
-        info.fAlphaType = fAlphaType;
+        SkImageInfo info = SkImageInfo::Make(bmp.width(), bmp.height(), fColorType, fAlphaType);
 
         for (int loop = 0; loop < loops; ++loop) {
             canvas->writePixels(info, bmp.getPixels(), bmp.rowBytes(), 0, 0);