gm -w 'directory' now works for recording the master images



git-svn-id: http://skia.googlecode.com/svn/trunk@229 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/xfermodes.cpp b/gm/xfermodes.cpp
index e82c057..b52af02 100644
--- a/gm/xfermodes.cpp
+++ b/gm/xfermodes.cpp
@@ -67,7 +67,7 @@
         return SkString("xfermodes");
     }
 
-	SkISize onISize() { return make_isize(400, 250); }
+	SkISize onISize() { return make_isize(640, 380); }
 
     void drawBG(SkCanvas* canvas) {
         canvas->drawColor(SK_ColorWHITE);