Add Sample slide for Rectanizers

src/gpu/GrRectanizer.h

Index: src/gpu/GrRectanizer.h
diff --git a/src/gpu/GrRectanizer.h b/src/gpu/GrRectanizer.h
index 2c290e9153ab20fd4cbc2b4d404e3012956dd205..0f9d8fdfb62ddd6bee739bee0a940792e6f43843 100644
--- a/src/gpu/GrRectanizer.h
+++ b/src/gpu/GrRectanizer.h
@@ -24,6 +24,8 @@ public:
     int width() const { return fWidth; }
     int height() const { return fHeight; }
 
+    // Attempt to add a rect. Return true on success; false on failure. If
+    // successful the position in the atlas is returned in 'loc'.
     virtual bool addRect(int width, int height, GrIPoint16* loc) = 0;
     virtual float percentFull() const = 0;