Set OS X cache directory to ~/Library/Caches/[app name]/[profile name] ...

base/file_path.cc

Index: base/file_path.cc
===================================================================
--- base/file_path.cc	(revision 26368)
+++ base/file_path.cc	(working copy)
@@ -159,6 +159,11 @@
 }
 
 bool FilePath::IsParent(const FilePath& child) const {
+  return AppendRelativePath(child, NULL);
+}
+
+bool FilePath::AppendRelativePath(const FilePath& child,
+                                  FilePath* path) const {
   std::vector<FilePath::StringType> parent_components;
   std::vector<FilePath::StringType> child_components;
   GetComponents(&parent_components);
@@ -194,6 +199,11 @@
     ++child_comp;
   }
 
+  if (path != NULL) {
+    for (; child_comp != child_components.end(); ++child_comp) {
+      *path = path->Append(*child_comp);
+    }
+  }
   return true;
 }