Telemetry: Skip page if a page action is not supported by the browser.

If a page requires touch scrolling, we currently report a failure if the browser
doesn't support touch. This means that no average numbers will be reported on the
dashboard.
Instead of failing, we could skip the page and show a warning message to make the
user aware of that.

BUG=355661

Review URL: https://codereview.chromium.org/230373005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263014 0039d316-1c4b-4281-b951-d872f2087c98

tools/telemetry/telemetry/page/page_runner.py

@@ -492,6 +492,8 @@ def _RunPage(test, page, state, expectation, results, finder_options):
     ProcessError()
     # Run() catches these exceptions to relaunch the tab/browser, so re-raise.
     raise
+  except page_action.PageActionNotSupported as e:
+    results.AddSkip(page, 'Unsupported page action: %s' % e)
   except Exception:
     logging.warning('While running %s', page.url)
     exception_formatter.PrintFormattedException()

tools/telemetry/telemetry/page/page_test_results.py

@@ -42,6 +42,7 @@ class PageTestResults(unittest.TestResult):
     self.successes.append(test)
 
   def addSkip(self, test, reason):  # Python 2.7 has this in unittest.TestResult
+    logging.warning('%s\n%s\nSkipping page.', test, reason)
     self.skipped.append((test, reason))
 
   def StartTest(self, page):