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/tests/GradientTest.cpp b/tests/GradientTest.cpp
index cf8fbee..cd66a3e 100644
--- a/tests/GradientTest.cpp
+++ b/tests/GradientTest.cpp
@@ -146,7 +146,7 @@
     outBitmap.allocPixels();
     SkPaint paint;
     paint.setShader(s.get());
-    SkDevice device(outBitmap);
+    SkBitmapDevice device(outBitmap);
     SkCanvas canvas(&device);
     canvas.drawPaint(paint);
     SkAutoLockPixels alp(outBitmap);