Telemetry: Add 'wait_after' parameter to gesture actions.

tools/telemetry/telemetry/page/actions/gesture_action.py

Index: tools/telemetry/telemetry/page/actions/gesture_action.py
diff --git a/tools/telemetry/telemetry/page/actions/gesture_action.py b/tools/telemetry/telemetry/page/actions/gesture_action.py
index df129d1a0b0f4b6aae2450040c81583285e8d34f..f8f5c9f5befda4eb034fbe2295813de43366a738 100644
--- a/tools/telemetry/telemetry/page/actions/gesture_action.py
+++ b/tools/telemetry/telemetry/page/actions/gesture_action.py
@@ -4,11 +4,17 @@
 
 import telemetry.core.timeline.bounds as timeline_bounds
 from telemetry.page.actions import page_action
+from telemetry.page.actions import wait
 
 class GestureAction(page_action.PageAction):
   def __init__(self, attributes=None):
     super(GestureAction, self).__init__(attributes)
 
+    if hasattr(self, 'wait_after'):
+      self.wait_action = wait.WaitAction(self.wait_after)
+    else:
+      self.wait_action = None
+
   def RunAction(self, page, tab, previous_action):
     tab.ExecuteJavaScript(
         'console.time("' + self._GetUniqueTimelineMarkerName() + '")')
@@ -18,6 +24,9 @@ class GestureAction(page_action.PageAction):
     tab.ExecuteJavaScript(
         'console.timeEnd("' + self._GetUniqueTimelineMarkerName() + '")')
 
+    if self.wait_action:
+      self.wait_action.RunAction(page, tab, previous_action)
+
   def RunGesture(self, page, tab, previous_action):
     raise NotImplementedError()
 
@@ -46,4 +55,10 @@ class GestureAction(page_action.PageAction):
       raise page_action.PageActionInvalidTimelineMarker(
           'More than one possible synthetic gesture marker found in timeline.')
 
-    return timeline_bounds.Bounds.CreateFromEvent(gesture_events[0])
+    active_range = timeline_bounds.Bounds.CreateFromEvent(gesture_events[0])
+
+    if self.wait_action:
+      active_range.AddBounds(
+          self.wait_action.GetActiveRangeOnTimeline(timeline))
+
+    return active_range