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/gm/texdata.cpp b/gm/texdata.cpp
index 612cc64..0e2d7fd 100644
--- a/gm/texdata.cpp
+++ b/gm/texdata.cpp
@@ -38,7 +38,7 @@
     }
 
     virtual void onDraw(SkCanvas* canvas) {
-        SkDevice* device = canvas->getTopDevice();
+        SkBaseDevice* device = canvas->getTopDevice();
         GrRenderTarget* target = device->accessRenderTarget();
         GrContext* ctx = GetGr();
         if (ctx && target) {