Make DownloadHistory observe manager, items

chrome/browser/history/history.h

Index: chrome/browser/history/history.h
diff --git a/chrome/browser/history/history.h b/chrome/browser/history/history.h
index e2cb32451e212666eb6c6ccb1f9ae66919e4aac7..a72458c03bfe0fef0b23287ef51191a3789516d6 100644
--- a/chrome/browser/history/history.h
+++ b/chrome/browser/history/history.h
@@ -35,19 +35,17 @@ class BookmarkService;
 class FilePath;
 class GURL;
 class HistoryURLProvider;
-struct HistoryURLProviderParams;
 class PageUsageData;
 class PageUsageRequest;
 class Profile;
+struct DownloadPersistentStoreInfo;
+struct HistoryURLProviderParams;
 
 namespace base {
 class Thread;
 class Time;
 }
 
-namespace content {
-struct DownloadPersistentStoreInfo;
-}
 
 namespace history {
 class InMemoryHistoryBackend;
@@ -93,8 +91,8 @@ class HistoryDBTask : public base::RefCountedThreadSafe<HistoryDBTask> {
 // The history service records page titles, and visit times, as well as
 // (eventually) information about autocomplete.
 //
-// This service is thread safe. Each request callback is invoked in the
-// thread that made the request.
+// This service is thread safe. Each request callback that uses a
+// CancelableRequestConsumer is invoked in the thread that made the request.
 class HistoryService : public CancelableRequestProvider,
                        public content::NotificationObserver,
                        public RefcountedProfileKeyedService {
@@ -444,15 +442,23 @@ class HistoryService : public CancelableRequestProvider,
 
   // Implemented by the caller of 'CreateDownload' below, and is called when the
   // history service has created a new entry for a download in the history db.
-  typedef base::Callback<void(int32, int64)> DownloadCreateCallback;
+  typedef base::Callback<void(int64)> DownloadCreateCallback;
 
   // Begins a history request to create a new persistent entry for a download.
   // 'info' contains all the download's creation state, and 'callback' runs
   // when the history service request is complete.
-  Handle CreateDownload(int32 id,
-                        const content::DownloadPersistentStoreInfo& info,
-                        CancelableRequestConsumerBase* consumer,
-                        const DownloadCreateCallback& callback);
+  virtual void CreateDownload(const DownloadPersistentStoreInfo& info,
+                              const DownloadCreateCallback& callback);
+
+  typedef base::Callback<
+      void(bool,        // Were we able to determine the # of visits?
+           int,         // Number of visits.
+           base::Time)> // Time of first visit. Only set if bool
+                        // is true and int is > 0.
+      GetVisibleVisitCountToHostSimpleCallback;
+  virtual void GetVisibleVisitCountToHostSimple(
+      const GURL& url,
+      const GetVisibleVisitCountToHostSimpleCallback& callback);
 
   // Implemented by the caller of 'GetNextDownloadId' below.
   typedef base::Callback<void(int)> DownloadNextIdCallback;
@@ -464,15 +470,14 @@ class HistoryService : public CancelableRequestProvider,
   // Implemented by the caller of 'QueryDownloads' below, and is called when the
   // history service has retrieved a list of all download state. The call
   typedef base::Callback<void(
-      std::vector<content::DownloadPersistentStoreInfo>*)>
+      scoped_ptr<std::vector<DownloadPersistentStoreInfo> >)>
           DownloadQueryCallback;
 
   // Begins a history request to retrieve the state of all downloads in the
   // history db. 'callback' runs when the history service request is complete,
   // at which point 'info' contains an array of DownloadPersistentStoreInfo, one
   // per download.
-  Handle QueryDownloads(CancelableRequestConsumerBase* consumer,
-                        const DownloadQueryCallback& callback);
+  virtual void QueryDownloads(const DownloadQueryCallback& callback);
 
   // Begins a request to clean up entries that has been corrupted (because of
   // the crash, for example).
@@ -481,22 +486,11 @@ class HistoryService : public CancelableRequestProvider,
   // Called to update the history service about the current state of a download.
   // This is a 'fire and forget' query, so just pass the relevant state info to
   // the database with no need for a callback.
-  void UpdateDownload(const content::DownloadPersistentStoreInfo& data);
-
-  // Called to update the history service about the path of a download.
-  // This is a 'fire and forget' query.
-  void UpdateDownloadPath(const FilePath& path, int64 db_handle);
-
-  // Permanently remove a download from the history system. This is a 'fire and
-  // forget' operation.
-  void RemoveDownload(int64 db_handle);
-
-  // Permanently removes all completed download from the history system within
-  // the specified range. This function does not delete downloads that are in
-  // progress or in the process of being cancelled. This is a 'fire and forget'
-  // operation. You can pass is_null times to get unbounded time in either or
-  // both directions.
-  void RemoveDownloadsBetween(base::Time remove_begin, base::Time remove_end);
+  virtual void UpdateDownload(const DownloadPersistentStoreInfo& data);
+
+  // Permanently remove a set of downloads from the history system. This is a
+  // 'fire and forget' operation.
+  virtual void RemoveDownloads(const std::set<int64>& handles);
 
   // Visit Segments ------------------------------------------------------------