[telemetry] Clean up image decoding benchmark

tools/telemetry/telemetry/page.py

Index: tools/telemetry/telemetry/page.py
diff --git a/tools/telemetry/telemetry/page.py b/tools/telemetry/telemetry/page.py
index 08b634d142557a9fc373cf9290ecb26c73f3dafc..a59da610cdad532dfb23277dffbe5d854d15fe80 100644
--- a/tools/telemetry/telemetry/page.py
+++ b/tools/telemetry/telemetry/page.py
@@ -67,6 +67,9 @@ class Page(object):
   @staticmethod
   def WaitForPageToLoad(obj, tab, timeout, poll_interval=0.1):
     """Waits for various wait conditions present in obj."""
+    if hasattr(obj, 'post_navigate_javascript_to_execute'):
+      tab.runtime.Evaluate(obj.post_navigate_javascript_to_execute)
+
     if hasattr(obj, 'wait_seconds'):
       time.sleep(obj.wait_seconds)
     if hasattr(obj, 'wait_for_element_with_text'):