Add favicon integration tests for FaviconDriverImpl

components/history/core/browser/history_service.h

Index: components/history/core/browser/history_service.h
diff --git a/components/history/core/browser/history_service.h b/components/history/core/browser/history_service.h
index dd6b19aa490f1898e9413cc7fa355269966a4ef5..8b3b641239ca280acfa2ab3a430794e3e5a7a41b 100644
--- a/components/history/core/browser/history_service.h
+++ b/components/history/core/browser/history_service.h
@@ -481,6 +481,10 @@ class HistoryService : public syncer::SyncableService, public KeyedService {
 
   // Testing -------------------------------------------------------------------
 
+  // Similar to Init() but uses the provided |task_runner| for the backend.
+  bool InitForTest(const HistoryDatabaseParams& history_database_params,
+                   scoped_refptr<base::SequencedTaskRunner> task_runner);
+
   // Runs |flushed| after bouncing off the history thread.
   void FlushForTest(const base::Closure& flushed);
 
@@ -573,6 +577,11 @@ class HistoryService : public syncer::SyncableService, public KeyedService {
   // that is only set by unittests which causes the backend to not init its DB.
   bool Init(bool no_db, const HistoryDatabaseParams& history_database_params);
 
+  // Similar to Init() but uses the provided |task_runner| for the backend.
+  bool InitWithTaskRunner(bool no_db,
+                          const HistoryDatabaseParams& history_database_params,
+                          scoped_refptr<base::SequencedTaskRunner> task_runner);
+
   // Called by the HistoryURLProvider class to schedule an autocomplete, it
   // will be called back on the internal history thread with the history
   // database so it can query. See history_url_provider.h for a diagram.