Modify power_LoadTest Extension to pull in test parameters.

client/site_tests/power_LoadTest/params.js

Index: client/site_tests/power_LoadTest/params.js
diff --git a/client/site_tests/power_LoadTest/params.js b/client/site_tests/power_LoadTest/params.js
new file mode 100644
index 0000000000000000000000000000000000000000..14e1ee014d975395db9806db431e508c17e94680
--- /dev/null
+++ b/client/site_tests/power_LoadTest/params.js
@@ -0,0 +1,10 @@
+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var test_time_ms = 60 * 60 * 1000;
+var should_scroll = true;
+var should_scroll_up = true;
+var scroll_loop = false;
+var scroll_interval_ms = 1000;
+var scroll_by_pixels = 600;