Rebuild test history databases when starting up performance_ui_tests.

chrome/test/perf/generate_profile.h

Index: chrome/test/perf/generate_profile.h
diff --git a/chrome/test/perf/generate_profile.h b/chrome/test/perf/generate_profile.h
new file mode 100644
index 0000000000000000000000000000000000000000..85a2858f39afe97134eda3e0fa2d79fc82a6220a
--- /dev/null
+++ b/chrome/test/perf/generate_profile.h
@@ -0,0 +1,29 @@
+// Copyright (c) 2013 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.
+
+#ifndef CHROME_TEST_PERF_GENERATE_PROFILE_H_
+#define CHROME_TEST_PERF_GENERATE_PROFILE_H_
+
+#include "base/compiler_specific.h"
+
+namespace base {
+class FilePath;
+}
+
+// Addition types data can be generated for. By default only urls/visits are
+// added.
+enum GenerateProfileTypes {
+  TOP_SITES = 1 << 0,
+  FULL_TEXT = 1 << 1
+};
+
+// Generates a user profile and history by psuedo-randomly generating data and
+// feeding it to the history service. (srand is initialized with whatever
+// urlcount is before profile is generated for deterministic output; it is
+// reset to time() afterwards.) Returns true if successful.
+bool GenerateProfile(GenerateProfileTypes types,
+                     int urlcount,
+                     const base::FilePath& dst_dir) WARN_UNUSED_RESULT;
+
+#endif  // CHROME_TEST_PERF_GENERATE_PROFILE_H_