Add ScrollPageToElement to action_runner.

telemetry/telemetry/internal/actions/action_runner.py

Index: telemetry/telemetry/internal/actions/action_runner.py
diff --git a/telemetry/telemetry/internal/actions/action_runner.py b/telemetry/telemetry/internal/actions/action_runner.py
index 4a0584be3cedf5f91ec4798730b269a045b9911d..367522b323d273d85d74cf5796d017b9d19a245b 100644
--- a/telemetry/telemetry/internal/actions/action_runner.py
+++ b/telemetry/telemetry/internal/actions/action_runner.py
@@ -22,6 +22,7 @@ from telemetry.internal.actions.repaint_continuously import (
 from telemetry.internal.actions.repeatable_scroll import RepeatableScrollAction
 from telemetry.internal.actions.scroll import ScrollAction
 from telemetry.internal.actions.scroll_bounce import ScrollBounceAction
+from telemetry.internal.actions.scroll_to_element import ScrollToElementAction
 from telemetry.internal.actions.seek import SeekAction
 from telemetry.internal.actions.swipe import SwipeAction
 from telemetry.internal.actions.tap import TapAction
@@ -393,6 +394,21 @@ class ActionRunner(object):
         speed_in_pixels_per_second=speed_in_pixels_per_second,
         use_touch=use_touch, synthetic_gesture_source=synthetic_gesture_source))
 
+  def ScrollPageToElement(self, selector=None, element_function=None,
+                          speed_in_pixels_per_second=800):
+    """Perform scroll gesture on page until an element is in view.
+
+    Args:
+      selector: A CSS selector describing the element.
+      element_function: A JavaScript function (as string) that is used
+          to retrieve the element. For example:
+          'function() { return foo.element; }'.
+      speed_in_pixels_per_second: Speed to scroll.
+    """
+    self._RunAction(ScrollToElementAction(
+        selector=selector, element_function=element_function,
+        speed_in_pixels_per_second=speed_in_pixels_per_second))
+
   def RepeatableBrowserDrivenScroll(self, x_scroll_distance_ratio=0.0,
                                     y_scroll_distance_ratio=0.5,
                                     repeat_count=0,