Strawman proposal for chrome.experimental.clear.*

chrome/browser/browsing_data_remover.h

Index: chrome/browser/browsing_data_remover.h
diff --git a/chrome/browser/browsing_data_remover.h b/chrome/browser/browsing_data_remover.h
index 8f6351af05246bcacf03312eb01dfc2968ce8ab4..870f5e7fe09a67ecc1018fffa99de933ac817182 100644
--- a/chrome/browser/browsing_data_remover.h
+++ b/chrome/browser/browsing_data_remover.h
@@ -98,6 +98,10 @@ class BrowsingDataRemover : public NotificationObserver,
   static bool is_removing() { return removing_; }
 
  private:
+  // The clear API needs to be able to toggle removing_ in order to test that
+  // only one BrowsingDataRemover instance can be called at a time.
+  FRIEND_TEST_ALL_PREFIXES(ExtensionApiTest, ClearOneAtATime);
+
   enum CacheState {
     STATE_NONE,
     STATE_CREATE_MAIN,
@@ -175,6 +179,10 @@ class BrowsingDataRemover : public NotificationObserver,
            !waiting_for_clear_lso_data_;
   }
 
+  // Setter for removing_; DCHECKs that we can only start removing if we're not
+  // already removing, and vice-versa.
+  static void set_removing(bool removing);
+
   NotificationRegistrar registrar_;
 
   // Profile we're to remove from.