add rowbytes option to allocPixels

src/animator/SkDrawBitmap.cpp

Index: src/animator/SkDrawBitmap.cpp
diff --git a/src/animator/SkDrawBitmap.cpp b/src/animator/SkDrawBitmap.cpp
index f481ee7dba619ad8d2373f274fe4511ef2a24b03..53497749a42a6ae6f951e01c3da062832d39e812 100644
--- a/src/animator/SkDrawBitmap.cpp
+++ b/src/animator/SkDrawBitmap.cpp
@@ -89,8 +89,8 @@ void SkDrawBitmap::onEndElement(SkAnimateMaker&) {
     SkASSERT(height != -1);
     SkASSERT(rowBytes >= 0);
     SkColorType colorType = SkColorType(format);
-    fBitmap.setInfo(SkImageInfo::Make(width, height, colorType, kPremul_SkAlphaType), rowBytes);
-    fBitmap.allocPixels();
+    fBitmap.allocPixels(SkImageInfo::Make(width, height, colorType, kPremul_SkAlphaType),
+                        rowBytes);
     if (fColorSet)
         fBitmap.eraseColor(fColor);
 }