fix win-only change (canvas -> rasterCanvas)



git-svn-id: http://skia.googlecode.com/svn/trunk@5719 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/views/SkWindow.cpp b/src/views/SkWindow.cpp
index 260ff5b..d427efb 100644
--- a/src/views/SkWindow.cpp
+++ b/src/views/SkWindow.cpp
@@ -194,7 +194,7 @@
 #endif
 #ifdef SK_BUILD_FOR_WIN32
         //try {
-            this->draw(canvas);
+            this->draw(&rasterCanvas);
         //}
         //catch (...) {
         //}