gpu testing: Handle non-integral device pixel ratio.

content/test/gpu/gpu_tests/cloud_storage_test_base.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.
 
 """Base classes for a test and validator which upload results
 (reference images, error images) to cloud storage."""
 
 import os
 import re
 import tempfile
 
 from telemetry import test
 from telemetry.core import bitmap
 from telemetry.page import cloud_storage
 from telemetry.page import page_test
 
 test_data_dir = os.path.abspath(os.path.join(
     os.path.dirname(__file__), '..', '..', 'data', 'gpu'))
 
 default_generated_data_dir = os.path.join(test_data_dir, 'generated')
 
 error_image_cloud_storage_bucket = 'chromium-browser-gpu-tests'
 
 def _CompareScreenshotSamples(screenshot, expectations, device_pixel_ratio):
   for expectation in expectations:
     location = expectation["location"]
-    x = location[0] * device_pixel_ratio
-    y = location[1] * device_pixel_ratio
+    x = int(location[0] * device_pixel_ratio)
+    y = int(location[1] * device_pixel_ratio)
 
     if x < 0 or y < 0 or x > screenshot.width or y > screenshot.height:
       raise page_test.Failure(
           'Expected pixel location [%d, %d] is out of range on [%d, %d] image' %
           (x, y, screenshot.width, screenshot.height))
 
     actual_color = screenshot.GetPixelColor(x, y)
     expected_color = bitmap.RgbaColor(
         expectation["color"][0],
         expectation["color"][1],
@@ skipping 204 matching lines @@
         default='')
     group.add_option('--test-machine-name',
         help='Name of the test machine. Specifying this argument causes this '
         'script to upload failure images and diffs to cloud storage directly, '
         'instead of relying on the archive_gpu_pixel_test_results.py script.',
         default='')
     group.add_option('--generated-dir',
         help='Overrides the default on-disk location for generated test images '
         '(only used for local testing without a cloud storage account)',
         default=default_generated_data_dir)