[Sync] Prevent uploading throttled datatypes.

chrome/browser/sync/sessions/sync_session_context.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/sessions/sync_session_context.h"
 
 #include "chrome/browser/sync/sessions/debug_info_getter.h"
 #include "chrome/browser/sync/sessions/session_state.h"
 #include "chrome/browser/sync/util/extensions_activity_monitor.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 40 matching lines @@
 
 void SyncSessionContext::SetUnthrottleTime(const syncable::ModelTypeSet& types,
                                            const base::TimeTicks& time) {
   for (syncable::ModelTypeSet::const_iterator it = types.begin();
        it != types.end();
        ++it) {
     unthrottle_times_[*it] = time;
   }
 }
 
+void SyncSessionContext::PruneUnthrottledTypes(const base::TimeTicks& time) {
+  UnthrottleTimes::iterator it = unthrottle_times_.begin();
+  while (it != unthrottle_times_.end()) {
+    if (it->second <= time) {
+      // Delete and increment the iterator.
+      UnthrottleTimes::iterator iterator_to_delete = it;
+      ++it;
+      unthrottle_times_.erase(iterator_to_delete);
+    } else {
+      // Just increment the iterator.
+      ++it;
+    }
+  }
+}
+
+// TODO(lipalani): Call this function and fill the return values in snapshot
+// so it could be shown in the about:sync page.
+syncable::ModelTypeSet SyncSessionContext::GetThrottledTypes() const {
+  syncable::ModelTypeSet types;
+  for (UnthrottleTimes::const_iterator it = unthrottle_times_.begin();
+       it != unthrottle_times_.end();
+       ++it) {
+    types.insert(it->first);
+  }
+  return types;
+}
+
 }  // namespace sessions
 }  // namespace browser_sync