Split SkDevice out of SkBitmapDevice

https://codereview.chromium.org/22978012/



git-svn-id: http://skia.googlecode.com/svn/trunk@10830 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/bitmapcopy.cpp b/gm/bitmapcopy.cpp
index 1c56bde..5e88cfd 100644
--- a/gm/bitmapcopy.cpp
+++ b/gm/bitmapcopy.cpp
@@ -66,7 +66,7 @@
         SkScalar horizMargin(SkIntToScalar(10));
         SkScalar vertMargin(SkIntToScalar(10));
 
-        SkDevice devTmp(SkBitmap::kARGB_8888_Config, 40, 40);
+        SkBitmapDevice devTmp(SkBitmap::kARGB_8888_Config, 40, 40, false);
         SkCanvas canvasTmp(&devTmp);
 
         draw_checks(&canvasTmp, 40, 40);