Allow defining custom navigation on a per-page basis.

tools/telemetry/telemetry/page/actions/javascript.py

Index: tools/telemetry/telemetry/page/actions/javascript.py
diff --git a/tools/telemetry/telemetry/page/actions/js_collect_garbage.py b/tools/telemetry/telemetry/page/actions/javascript.py
similarity index 62%
copy from tools/telemetry/telemetry/page/actions/js_collect_garbage.py
copy to tools/telemetry/telemetry/page/actions/javascript.py
index 3ba9f53b30764a42b5c42777c537ccea1eb3af3b..a192e9e5695ced7bfe136853da1c52b82facc59f 100644
--- a/tools/telemetry/telemetry/page/actions/js_collect_garbage.py
+++ b/tools/telemetry/telemetry/page/actions/javascript.py
@@ -1,11 +1,14 @@
 # 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.
+
 from telemetry.page.actions import page_action
 
-class JsCollectGarbageAction(page_action.PageAction):
+
+class JavascriptAction(page_action.PageAction):
   def __init__(self, attributes=None):
-    super(JsCollectGarbageAction, self).__init__(attributes)
+    super(JavascriptAction, self).__init__(attributes)
 
   def RunAction(self, page, tab, previous_action):
-    tab.CollectGarbage()
+    assert hasattr(self, 'expression')
+    tab.ExecuteJavaScript(self.expression)