Modify power_LoadTest Extension to pull in test parameters.

client/site_tests/power_LoadTest/extension/testparams.js

+// 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.
+
+// External Test Parameters Content Script!
+
+// initial values.
+var test_time_ms = 0;
+var should_scroll = false;
+var should_scroll_up = false;
+var scroll_loop = false;
+var scroll_interval_ms = 0;
+var scroll_by_pixels = 0;
+
+document.getElementById('myCustomEventDiv').addEventListener('myCustomEvent',
+  function() {
+    // pull our test parameters from divs on this page.
+    var eventData = document.getElementById('myCustomEventDiv').innerText;
+    test_time_ms = document.getElementById('test_time_ms').innerText;
+    should_scroll = document.getElementById('should_scroll').innerText;
+    should_scroll_up = document.getElementById('should_scroll_up').innerText;
+    scroll_loop = document.getElementById('scroll_loop').innerText;
+    scroll_interval_ms = document.getElementById('scroll_interval_ms').innerText;
+    scroll_by_pixels = document.getElementById('scroll_by_pixels').innerText;
+
+    // pass to background page via sendRequest.
+    var request = { _test_time_ms : test_time_ms,
+                    _should_scroll : should_scroll,
+                    _should_scroll_up : should_scroll_up,
+                    _scroll_loop : scroll_loop,
+                    _scroll_interval_ms : scroll_interval_ms,
+                    _scroll_by_pixels : scroll_by_pixels
+                  }
+    chrome.extension.sendRequest(request);
+  }
+);
+