Two malloc+bzero -> calloc.

src/image/SkSurface_Raster.cpp

Index: src/image/SkSurface_Raster.cpp
diff --git a/src/image/SkSurface_Raster.cpp b/src/image/SkSurface_Raster.cpp
index d5593eb1d7dd1e72872df0ab3c0707fe6108371d..a606656709457699ee998b7ec9a311a755fd7579 100644
--- a/src/image/SkSurface_Raster.cpp
+++ b/src/image/SkSurface_Raster.cpp
@@ -99,10 +99,6 @@ SkSurface_Raster::SkSurface_Raster(SkPixelRef* pr, const SkSurfaceProps* props)
     fBitmap.setInfo(info, info.minRowBytes());
     fBitmap.setPixelRef(pr);
     fWeOwnThePixels = true;
-
-    if (!info.isOpaque()) {
-        fBitmap.eraseColor(SK_ColorTRANSPARENT);
-    }
 }
 
 SkCanvas* SkSurface_Raster::onNewCanvas() { return new SkCanvas(fBitmap, this->props()); }
@@ -185,7 +181,7 @@ SkSurface* SkSurface::NewRaster(const SkImageInfo& info, const SkSurfaceProps* p
         return nullptr;
     }
 
-    SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewAllocate(info, 0, nullptr));
+    SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewZeroed(info, 0, nullptr));
     if (nullptr == pr.get()) {
         return nullptr;
     }