Add page.CanRunOnBrowser. Add WebGL check for tough_webgl_cases pages

tools/perf/page_sets/tough_webgl_cases.py

 # Copyright 2014 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 logging
+
 # pylint: disable=W0401,W0614
 from telemetry.page.actions.all_page_actions import *
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class ToughWebglCasesPage(page_module.Page):
 
   def __init__(self, url, page_set):
     super(ToughWebglCasesPage, self).__init__(url=url, page_set=page_set)
     self.archive_data_file = 'data/tough_webgl_cases.json'
 
+  def CanRunOnBrowser(self, browser_info):
+    if not browser_info.HasWebGLSupport():
+      logging.warning('Browser does not support webgl, skipping test')
+      return False
+    return True
+
   def RunNavigateSteps(self, action_runner):
     action_runner.NavigateToPage(self)
     action_runner.RunAction(WaitAction(
       {
         'javascript': 'document.readyState == "complete"'
       }))
     action_runner.RunAction(WaitAction({'seconds': 2}))
 
   def RunSmoothness(self, action_runner):
     action_runner.RunAction(WaitAction({'seconds': 5}))
@@ skipping 57 matching lines @@
       'http://www.khronos.org/registry/webgl/sdk/demos/webkit/Earth.html',
       # pylint: disable=C0301
       'http://www.khronos.org/registry/webgl/sdk/demos/webkit/ManyPlanetsDeep.html',
       'http://webglsamples.googlecode.com/hg/aquarium/aquarium.html',
       'http://webglsamples.googlecode.com/hg/blob/blob.html',
       # pylint: disable=C0301
       'http://webglsamples.googlecode.com/hg/dynamic-cubemap/dynamic-cubemap.html'
     ]
     for url in urls_list:
       self.AddPage(ToughWebglCasesPage(url, self))