Enable pinch-zoom telemetry on Mac

tools/telemetry/telemetry/internal/actions/pinch.py

 # Copyright 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.
 import os
 
 from telemetry.internal.actions import page_action
 
 
 class PinchAction(page_action.PageAction):
   def __init__(self, selector=None, text=None, element_function=None,
@@ skipping 25 matching lines @@
     if not tab.EvaluateJavaScript('window.__PinchAction_SupportedByBrowser()'):
       raise page_action.PageActionNotSupported(
           'Synthetic pinch not supported for this browser')
 
     # TODO(dominikg): Remove once JS interface changes have rolled into stable.
     if not tab.EvaluateJavaScript('chrome.gpuBenchmarking.newPinchInterface'):
       raise page_action.PageActionNotSupported(
           'This version of the browser doesn\'t support the new JS interface '
           'for pinch gestures.')
 
-    if (self._synthetic_gesture_source ==
-        'chrome.gpuBenchmarking.MOUSE_INPUT'):
-      raise page_action.PageActionNotSupported(
-          'Pinch page action does not support mouse input')
-
-    if not page_action.IsGestureSourceTypeSupported(tab, 'touch'):
-      raise page_action.PageActionNotSupported(
-          'Touch input not supported for this browser')
-
     done_callback = 'function() { window.__pinchActionDone = true; }'
     tab.ExecuteJavaScript("""
         window.__pinchActionDone = false;
         window.__pinchAction = new __PinchAction(%s);"""
         % done_callback)
 
   @staticmethod
   def _GetDefaultScaleFactorForPage(tab):
     current_scale_factor = tab.EvaluateJavaScript(
         'window.outerWidth / window.innerWidth')
@@ skipping 15 matching lines @@
             speed: %s
           });
         }''' % (self._left_anchor_ratio,
                 self._top_anchor_ratio,
                 scale_factor,
                 self._speed)
     page_action.EvaluateCallbackWithElement(
         tab, code, selector=self._selector, text=self._text,
         element_function=self._element_function)
     tab.WaitForJavaScriptExpression('window.__pinchActionDone', 60)