Smoke test for tracing infrastructure in PyAuto

chrome/test/functional/tracing/tab_tracker.py

Index: chrome/test/functional/tracing/tab_tracker.py
diff --git a/chrome/test/functional/tracing/tab_tracker.py b/chrome/test/functional/tracing/tab_tracker.py
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+# Copyright (c) 2012 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.
+
+import uuid
+
+
+class TabTracker:
+  """Uniquely track tabs within a window.
+
+  This allows the creation of tabs whose indices can be
+  determined even after lower indexed tabs have been closed, therefore changing
+  that tab's index.
+
+  This is accomplished via a containing window which is created and tracked via
+  the window's index. As a result of this, all calls to open and close tabs in
+  this TabTracker's window must go through the appropriate instance of the
+  TabTracker. Also note that if a lower indexed window is closed after this
+  TabTracker is instantiated, this TabTracker will lose track of its window"""
+
+  def __init__(self, browser, visible=False):
+    """
+    Args:
+      browser: an instance of PyUITest
+      visible: whether or not this TabTracker's window will be visible
+    """
+    # A binary search tree would be faster, but this is easier to write.
+    # If this needs to become faster, understand that the important operations
+    # here are append, arbitrary deletion and searching.
+    self._uuids = [None]
+    self._window_idx = browser.GetBrowserWindowCount()
+    self._browser = browser
+    browser.OpenNewBrowserWindow(visible)
+    # We leave the 0'th tab empty to have something to close on __del__
+
+  def __del__(self):
+    self._browser.CloseBrowserWindow(self._window_idx)
+
+  def CreateTab(self, url='about:blank'):
+    """Create a tracked tab and return its uuid.
+
+    Args:
+      url: a URL to navigate to
+
+    Returns:
+      a uuid uniquely identifying that tab within this TabTracker
+    """
+    self._browser.AppendTab(url, self._window_idx)
+    # We use uuids here rather than a monotonic integer to prevent confusion
+    # with the tab index.
+    tab_uuid = uuid.uuid4()
+    self._uuids.append(tab_uuid)
+    return tab_uuid
+
+  def ReleaseTab(self, tab_uuid):
+    """Release and close a tab tracked by this TabTracker.
+
+    Args:
+      tab_uuid: the uuid of the tab to close
+    """
+    idx = self.GetTabIndex(tab_uuid)
+    self._browser.GetBrowserWindow(self._window_idx).GetTab(idx).Close()
+    del self._uuids[idx]
+
+  def GetTabIndex(self, tab_uuid):
+    """Get the index of a tracked tab within this TabTracker's window.
+
+    Args:
+      tab_uuid: the uuid of the tab to close
+
+    Returns:
+      the index of the tab within this TabTracker's window
+    """
+    return self._uuids.index(tab_uuid)
+
+  def GetWindowIndex(self):
+    """Get the index of this TabTracker's window.
+
+    Returns:
+      the index of this TabTracker's window
+    """
+    return self._window_idx