Add a function to the History{Service,Backend} to query for a list of redirects ending at a specified URL.

Add the list of redirects leading to the URL to URLVisitedDetails which is broadcasted on HISTORY_URL_VISITED.

BUG=NONE
TEST=NONE

Review URL: http://codereview.chromium.org/151055

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19667 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 14 insertions, 0 deletions

diff --git a/chrome/browser/history/history_backend.h b/chrome/browser/history/history_backend.h
index 1e08bab..421e0a0 100644
--- a/chrome/browser/history/history_backend.h
+++ b/chrome/browser/history/history_backend.h
@@ -142,6 +142,8 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
                     const QueryOptions& options);
   void QueryRedirectsFrom(scoped_refptr<QueryRedirectsRequest> request,
                           const GURL& url);
+  void QueryRedirectsTo(scoped_refptr<QueryRedirectsRequest> request,
+                        const GURL& url);
 
   void GetVisitCountToHost(scoped_refptr<GetVisitCountToHostRequest> request,
                            const GURL& url);
@@ -155,6 +157,13 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   bool GetMostRecentRedirectsFrom(const GURL& url,
                                   HistoryService::RedirectList* redirects);
 
+  // Similar to above function except computes a chain of redirects to the
+  // given URL. Stores the most recent list of redirects ending at |url| in the
+  // given RedirectList. For example, if we have the redirect list A -> B -> C,
+  // then calling this function with url=C would fill redirects with {B, A}.
+  bool GetMostRecentRedirectsTo(const GURL& url,
+                                      HistoryService::RedirectList* redirects);
+
   // Thumbnails ----------------------------------------------------------------
 
   void SetPageThumbnail(const GURL& url,
@@ -298,6 +307,11 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   void GetRedirectsFromSpecificVisit(
       VisitID cur_visit, HistoryService::RedirectList* redirects);
 
+  // Similar to the above function except returns a redirect list ending
+  // at |cur_visit|.
+  void GetRedirectsToSpecificVisit(
+      VisitID cur_visit, HistoryService::RedirectList* redirects);
+
   // Thumbnail Helpers ---------------------------------------------------------
 
   // When a simple GetMostRecentRedirectsFrom() fails, this method is