Adding browser pixel test for linear-rgb support in Canvas.

content/test/gpu/gpu_tests/pixel_test_pages.py

 # Copyright 2016 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.
 
 class PixelTestPage(object):
   """A wrapper class mimicking the functionality of the PixelTestsStorySet
   from the old-style GPU tests.
   """
   def __init__(self, url, name, test_rect, revision,
                expected_colors=None, tolerance=2, browser_args=None):
@@ skipping 203 matching lines @@
       test_rect=[0, 0, 300, 300],
       revision=3,
       browser_args=browser_args + ['--disable-accelerated-2d-canvas']),
 
     PixelTestPage(
       'pixel_offscreenCanvas_2d_commit_worker.html',
       base_name + '_OffscreenCanvasUnaccelerated2DGPUCompositingWorker',
       test_rect=[0, 0, 300, 300],
       revision=3,
       browser_args=browser_args + ['--disable-accelerated-2d-canvas']),
-  ]
+
+    PixelTestPage(
+      'pixel_canvas_display_linear-rgb.html',
+      base_name + '_CanvasDisplayLinearRGBAccelerated2D',
+      test_rect=[0, 0, 140, 140],
+      revision=1,
+      browser_args=browser_args),
+
+    PixelTestPage(
+      'pixel_canvas_display_linear-rgb.html',
+      base_name + '_CanvasDisplayLinearRGBUnaccelerated2D',
+      test_rect=[0, 0, 140, 140],
+      revision=1,
+      browser_args=browser_args + unaccelerated_args),
+
+    PixelTestPage(
+      'pixel_canvas_display_linear-rgb.html',
+      base_name + '_CanvasDisplayLinearRGBUnaccelerated2DGPUCompositing',
+      test_rect=[0, 0, 140, 140],
+      revision=1,
+      browser_args=browser_args + ['--disable-accelerated-2d-canvas']),
+]
 
 
 # Pages that should be run with various macOS specific command line
 # arguments.
 def MacSpecificPages(base_name):
   iosurface_2d_canvas_args = [
     '--enable-accelerated-2d-canvas',
     '--disable-display-list-2d-canvas']
 
   non_chromium_image_args = ['--disable-webgl-image-chromium']
@@ skipping 46 matching lines @@
       test_rect=[0, 0, 300, 300],
       revision=2),
     PixelTestPage(
       'filter_effects.html',
       base_name + '_CSSFilterEffects_NoOverlays',
       test_rect=[0, 0, 300, 300],
       revision=2,
       tolerance=10,
       browser_args=['--disable-mac-overlays']),
   ]