Adding performance tests for HQP that represent importance of optimising HistoryItemsForTerms method

chrome/test/base/ui_test_utils.h

Index: chrome/test/base/ui_test_utils.h
diff --git a/chrome/test/base/ui_test_utils.h b/chrome/test/base/ui_test_utils.h
index 38ac0db71686916b457c353bb064adc34845b63f..e317b18a430512fc03ea14a4388ab651d757a6dc 100644
--- a/chrome/test/base/ui_test_utils.h
+++ b/chrome/test/base/ui_test_utils.h
@@ -26,6 +26,7 @@
 #include "ui/gfx/native_widget_types.h"
 #include "url/gurl.h"
 
+class AutocompleteController;
 class Browser;
 class LocationBar;
 class Profile;
@@ -131,6 +132,11 @@ bool GetRelativeBuildDirectory(base::FilePath* build_dir);
 // Blocks until an application modal dialog is showns and returns it.
 app_modal::AppModalDialog* WaitForAppModalDialog();
 
+// Waits for |autocomplete_controller| to stop, i.e. waits
+// NOTIFICATION_AUTOCOMPLETE_CONTROLLER_RESULT_READY.
+void WaitForAutocompleteController(
+    const AutocompleteController& autocomplete_controller);
+
 // Performs a find in the page of the specified tab. Returns the number of
 // matches found.  |ordinal| is an optional parameter which is set to the index
 // of the current match. |selection_rect| is an optional parameter which is set