Add GPU integration pixel tests for VP9 and MP4 video.

content/test/gpu/gpu_tests/pixel_integration_test.py

Index: content/test/gpu/gpu_tests/pixel_integration_test.py
diff --git a/content/test/gpu/gpu_tests/pixel_integration_test.py b/content/test/gpu/gpu_tests/pixel_integration_test.py
index 83da9ab8b6565061d69772e9fd17b9dcdafbb966..6e308c6c117a2002eaaf0cd3c2148c230b6217f8 100644
--- a/content/test/gpu/gpu_tests/pixel_integration_test.py
+++ b/content/test/gpu/gpu_tests/pixel_integration_test.py
@@ -15,11 +15,14 @@ from gpu_tests import pixel_test_pages
 from py_utils import cloud_storage
 from telemetry.util import image_util
 
+root_data_path = os.path.abspath(os.path.join(
+    os.path.dirname(__file__), '..', '..', 'data'))
+gpu_data_dir = os.path.join(root_data_path, 'gpu')
 
-test_data_dir = os.path.abspath(os.path.join(
-    os.path.dirname(__file__), '..', '..', 'data', 'gpu'))
+default_reference_image_dir = os.path.join(gpu_data_dir, 'gpu_reference')
 
-default_reference_image_dir = os.path.join(test_data_dir, 'gpu_reference')
+test_data_dirs = [gpu_data_dir,
+                  os.path.join(root_data_path, 'media')]
 
 test_harness_script = r"""
   var domAutomationController = {};
@@ -68,7 +71,7 @@ class PixelIntegrationTest(
     cls._original_finder_options = cls._finder_options.Copy()
     cls.CustomizeBrowserArgs([])
     cls.StartBrowser()
-    cls.SetStaticServerDirs([test_data_dir])
+    cls.SetStaticServerDirs(test_data_dirs)
 
   @classmethod
   def CustomizeBrowserArgs(cls, browser_args):
@@ -119,7 +122,7 @@ class PixelIntegrationTest(
     if sys.platform.startswith('darwin'):
       pages += pixel_test_pages.MacSpecificPages(name)
     for p in pages:
-      yield(p.name, p.url, (p))
+      yield(p.name, "gpu/" + p.url, (p))
 
   def RunActualGpuTest(self, test_path, *args):
     page = args[0]