Replace reference parameter with pointer so that we can pass NULL
in SkDrawPaint::add(); check the pointer when it's used to avoid
dereferencing NULL.

Add title to Animator sample slide.



git-svn-id: http://skia.googlecode.com/svn/trunk@1825 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/animator/SkPaintParts.cpp b/src/animator/SkPaintParts.cpp
index 48799c6..38d3ae0 100644
--- a/src/animator/SkPaintParts.cpp
+++ b/src/animator/SkPaintParts.cpp
@@ -61,7 +61,7 @@
         fPaint->fOwnsPathEffect = true;
         return false;
     }
-    fPaint->add(*(SkAnimateMaker*) NULL, this);
+    fPaint->add(NULL, this);
     return false;
 }