Split SkDevice into SkBaseDevice and SkBitmapDevice

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



git-svn-id: http://skia.googlecode.com/svn/trunk@10995 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/DeferredCanvasBench.cpp b/bench/DeferredCanvasBench.cpp
index 9e7e7238..e14bb24 100644
--- a/bench/DeferredCanvasBench.cpp
+++ b/bench/DeferredCanvasBench.cpp
@@ -26,7 +26,7 @@
     }
 
     virtual void onDraw(SkCanvas* canvas) {
-        SkDevice *device = canvas->getDevice()->createCompatibleDevice(
+        SkBaseDevice *device = canvas->getDevice()->createCompatibleDevice(
             SkBitmap::kARGB_8888_Config, CANVAS_WIDTH, CANVAS_HEIGHT, false);
 
         SkAutoTUnref<SkDeferredCanvas> deferredCanvas(SkDeferredCanvas::Create(device));