be sure to erase complete (i.e. before the softclip)



git-svn-id: http://skia.googlecode.com/svn/trunk@2558 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SamplePageFlip.cpp b/samplecode/SamplePageFlip.cpp
index 1db0b2a..b2d96f0 100644
--- a/samplecode/SamplePageFlip.cpp
+++ b/samplecode/SamplePageFlip.cpp
@@ -70,11 +70,10 @@
             // this must be local to the loop, since it needs to forget the pixels
             // its writing to after each iteration, since we do the swap
             SkCanvas    canvas(update.bitmap());
-            canvas.clipRect(clipR, SkRegion::kIntersect_Op, true);
-
             canvas.clipRegion(update.dirty());
-            
             canvas.drawColor(0, SkXfermode::kClear_Mode);            
+            canvas.clipRect(clipR, SkRegion::kIntersect_Op, true);
+            
             canvas.drawOval(oval, paint);
         }
         bounce(&x, &dx, WIDTH-OVALW);