Add useDFT field to SkDeviceProperties

src/core/SkBitmapDevice.cpp

Index: src/core/SkBitmapDevice.cpp
diff --git a/src/core/SkBitmapDevice.cpp b/src/core/SkBitmapDevice.cpp
index 343bbc8893a814a4dec83ea4375ec7a9671c80bb..8e8c10244bd5beb139dd3c8fd094d36c42acf358 100644
--- a/src/core/SkBitmapDevice.cpp
+++ b/src/core/SkBitmapDevice.cpp
@@ -117,7 +117,7 @@ void SkBitmapDevice::replaceBitmapBackendForRasterSurface(const SkBitmap& bm) {
 }
 
 SkBaseDevice* SkBitmapDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint*) {
-    SkDeviceProperties leaky(cinfo.fPixelGeometry);
+    const SkDeviceProperties leaky(cinfo.fPixelGeometry);
     return SkBitmapDevice::Create(cinfo.fInfo, &leaky);
 }