Telemetry media Seek action and metrics.

tools/telemetry/telemetry/page/actions/media_action.py

Index: tools/telemetry/telemetry/page/actions/media_action.py
diff --git a/tools/telemetry/telemetry/page/actions/media_action.py b/tools/telemetry/telemetry/page/actions/media_action.py
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+++ b/tools/telemetry/telemetry/page/actions/media_action.py
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+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Common media action functions."""
+
+import os
+
+from telemetry.core import util
+from telemetry.page.actions import page_action
+
+
+class MediaAction(page_action.PageAction):
+  def __init__(self, attributes=None):
+    super(MediaAction, self).__init__(attributes)
+
+  def WillRunAction(self, page, tab):
+    """Loads the common media action JS code prior to running the action."""
+    self.LoadJS(tab, 'media_action.js')
+
+  def RunAction(self, page, tab, previous_action):
+    super(MediaAction, self).RunAction(page, tab, previous_action)
+
+  def LoadJS(self, tab, js_file_name):
+    """Loads and executes a JS file in the tab."""
+    with open(os.path.join(os.path.dirname(__file__), js_file_name)) as f:
+      js = f.read()
+      tab.ExecuteJavaScript(js)
+
+  def WaitForEvent(self, tab, selector, event_name, timeout,
+                   poll_interval=0.5):
+    """Halts media action until the selector's event is fired.
+
+    Args:
+      tab: The tab to check for event on.
+      selector: Media element selector.
+      event_name: Name of the event to check if fired or not.
+      timeout: Timeout to check for event, throws an exception if not fired.
+      poll_interval: Interval to poll for event firing status.
+    """
+    util.WaitFor(lambda: self.HasEventCompleted(tab, selector, event_name),
+                 timeout=timeout, poll_interval=poll_interval)
+
+  def HasEventCompleted(self, tab, selector, event_name):
+    return tab.EvaluateJavaScript(
+        'window.__hasEventCompleted("%s", "%s");' % (selector, event_name))