cc: Generate tilings at other scales for impl-side painting

cc/scoped_ptr_vector.h

Index: cc/scoped_ptr_vector.h
diff --git a/cc/scoped_ptr_vector.h b/cc/scoped_ptr_vector.h
index 2a8d9610a69c6f02f894b3bfd9203955a40c5867..5971daf775ac1d0266caa13131f4a176b12eba98 100644
--- a/cc/scoped_ptr_vector.h
+++ b/cc/scoped_ptr_vector.h
@@ -139,6 +139,11 @@ class ScopedPtrVector {
     std::swap(*writable_a, *writable_b);
   }
 
+  template<class Compare>
+  inline void sort(Compare comp) {
+   std::sort(data_.begin(), data_.end(), comp);
+  }
+
   iterator begin() { return static_cast<iterator>(data_.begin()); }
   const_iterator begin() const { return data_.begin(); }
   iterator end() { return static_cast<iterator>(data_.end()); }