sync: Add GetAllSyncData to sync/api

chrome/browser/history/history_unittest.cc

Index: chrome/browser/history/history_unittest.cc
diff --git a/chrome/browser/history/history_unittest.cc b/chrome/browser/history/history_unittest.cc
index 53ffcf5fc64280a39acdb2d3ced901184af6a12b..67f1e50a2901022e5b50b109cc27881eb226b900 100644
--- a/chrome/browser/history/history_unittest.cc
+++ b/chrome/browser/history/history_unittest.cc
@@ -1553,6 +1553,11 @@ class TestChangeProcessor : public syncer::SyncChangeProcessor {
     return syncer::SyncError();
   }
 
+  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const
+      OVERRIDE {
+    return syncer::SyncDataList();
+  }
+
   const syncer::SyncChangeList& GetChanges() const {
     return changes_;
   }
@@ -1584,6 +1589,11 @@ class SyncChangeProcessorDelegate : public syncer::SyncChangeProcessor {
     return recipient_->ProcessSyncChanges(from_here, change_list);
   }
 
+  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const
+      OVERRIDE {
+    return recipient_->GetAllSyncData(type);
+  }
+
  private:
   // The recipient of all sync changes.
   syncer::SyncChangeProcessor* const recipient_;