Add method Vector::shrinkToReasonableCapacity()

Source/wtf/Vector.h

Index: Source/wtf/Vector.h
diff --git a/Source/wtf/Vector.h b/Source/wtf/Vector.h
index ab18fe5fe421fae435d5627c5adcc6542d981021..e42413f9a46fa79d8cc96824953218af7d0b029b 100644
--- a/Source/wtf/Vector.h
+++ b/Source/wtf/Vector.h
@@ -675,6 +675,11 @@ static const size_t kInitialVectorSize = WTF_VECTOR_INITIAL_SIZE;
         void reserveCapacity(size_t newCapacity);
         void reserveInitialCapacity(size_t initialCapacity);
         void shrinkToFit() { shrinkCapacity(size()); }
+        void shrinkToReasonableCapacity()
+        {
+            if (size() * 2 < capacity())
+                shrinkCapacity(size() + size() / 4 + 1);

[abarth-chromium, 2014/04/17 19:21:36]

Is there a problem with integer overflow in this code?

See void Vector<T, inlineCapacity, Allocator>::expandCapacity(size_t
newMinCapacity) for some worries about integer overflow in a similar codepath.

+        }
 
         void clear() { shrinkCapacity(0); }