[chromedriver] Implement touch down, up, and move commands.

chrome/test/chromedriver/test_expectations

 # 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.
 
 """Test expectation list for WebDriver Java acceptance tests.
 
 It is evaluated through Python.
 """
 
 import fnmatch
@@ skipping 142 matching lines @@
     'TakesScreenshotTest.testShouldCaptureScreenshotAtFramePage',
     'TakesScreenshotTest.testShouldCaptureScreenshotAtFramePageAfterSwitching',
     'TakesScreenshotTest.testShouldCaptureScreenshotAtIFramePageAfterSwitching',
 
     # Alerts are not yet supported on Android.
     'AlertsTest.*',
 
     # http://crbug.com/156390
     'DragAndDropTest.*',
 
-    # Touch events are not yet supported.
+    # Flick touch events are not yet implemented.
     'TouchFlickTest.*',
+
+    # Scrolling touch events are not supported.
     'TouchScrollTest.*',
-    'TouchSingleTapTest.*',
 
     # These tests start multiple sessions, which is not supported on a single
     # Android device.
     "AvailableLogsTest.shouldBeAbleToEnableProfilerLog",
     "GetLogsTest.turningOffLogShouldMeanNoLogMessages",
     "SessionHandlingTest.callingAnyOperationAfterQuitShouldThrowAnException",
     "SessionHandlingTest.callingQuitMoreThanOnceOnASessionIsANoOp",
     # Test is written using local files; doesn't work on Android.
     'UploadTest.testFileUploading',
     # Not applicable on Chromium Test Shell (doesn't support tabs).
@@ skipping 33 matching lines @@
 
   Returns:
     Set of passed test names.
   """
   filters = (_OS_NEGATIVE_FILTER[operating_system] +
              _GetRevisionNegativeFilter(chrome_version))
   passed = set(tests)
   for f in filters:
     passed.difference_update(set(t for t in tests if fnmatch.fnmatch(t, f)))
   return passed