[telemetry] rasterize_and_record_micro: Increase timeout for document to load

Increasing wait time for document's state to become 'complete'.

BUG=

Review URL: https://codereview.chromium.org/395133008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284220 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/measurements/rasterize_and_record_micro.py

@@ -58,7 +58,7 @@ class RasterizeAndRecordMicro(page_measurement.PageMeasurement):
 
   def MeasurePage(self, page, tab, results):
     try:
-      tab.WaitForJavaScriptExpression("document.readyState == 'complete'", 10)
+      tab.WaitForDocumentReadyStateToBeComplete()
     except TimeoutException:
       pass
     time.sleep(self.options.start_wait_time)