Add module for counting date-last-roll-call and persisting those counts

components/update_client/configurator.h

Index: components/update_client/configurator.h
diff --git a/components/update_client/configurator.h b/components/update_client/configurator.h
index 177c4a7771b19a5142da98b2411be356e7cc902c..b65f42ad0402b2c8fc07208555e5e5e1fdadc596 100644
--- a/components/update_client/configurator.h
+++ b/components/update_client/configurator.h
@@ -14,6 +14,7 @@
 class GURL;
 
 namespace base {
+class FilePath;
 class SequencedTaskRunner;
 class Version;
 }
@@ -111,6 +112,10 @@ class Configurator : public base::RefCountedThreadSafe<Configurator> {
   virtual scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner()
       const = 0;
 
+  // Returns a path at which metadata information about updatable items can be
+  // persisted. If the path is .empty(), no information will be persisted.
+  virtual base::FilePath GetMetadataPath() const = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<Configurator>;