[Telemetry] Migrate bitmap.py from bitmaptools.cc to numpy

content/test/gpu/gpu_tests/maps.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.
 
 """Runs a Google Maps pixel test.
 Performs several common navigation actions on the map (pan, zoom, rotate) then
 captures a screenshot and compares selected pixels against expected values"""
 
 import json
 import optparse
 import os
 
 import cloud_storage_test_base
 import maps_expectations
 
 from telemetry import benchmark
-from telemetry.core import bitmap
 from telemetry.core import util
 from telemetry.page import page
 from telemetry.page import page_set
 from telemetry.page import page_test
 
 class _MapsValidator(cloud_storage_test_base.ValidatorBase):
   def CustomizeBrowserOptions(self, options):
     options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
 
   def ValidateAndMeasurePage(self, page, tab, results):
     # TODO: This should not be necessary, but it's not clear if the test is
     # failing on the bots in it's absence. Remove once we can verify that it's
     # safe to do so.
     _MapsValidator.SpinWaitOnRAF(tab, 3)
 
     if not tab.screenshot_supported:
       raise page_test.Failure('Browser does not support screenshot capture')
     screenshot = tab.Screenshot(5)
-    if not screenshot:
+    if screenshot is None:
       raise page_test.Failure('Could not capture screenshot')
 
     dpr = tab.EvaluateJavaScript('window.devicePixelRatio')
     expected = self._ReadPixelExpectations(page)
     self._ValidateScreenshotSamples(
         page.display_name, screenshot, expected, dpr)
 
   @staticmethod
   def SpinWaitOnRAF(tab, iterations, timeout = 60):
     waitScript = r"""
@@ skipping 48 matching lines @@
     return maps_expectations.MapsExpectations()
 
   def CreatePageSet(self, options):
     page_set_path = os.path.join(
         util.GetChromiumSrcDir(), 'content', 'test', 'gpu', 'page_sets')
     ps = page_set.PageSet(archive_data_file='data/maps.json',
                           file_path=page_set_path,
                           bucket=page_set.PUBLIC_BUCKET)
     ps.AddUserStory(MapsPage(ps, ps.base_dir))
     return ps