Add GPU integration pixel tests for VP9 and MP4 video.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index e7f2d354bab1e3678bbf81a497b564850fb79f5b..656f094d0a65bbf2f9a19c8793b9d1c2732a4a9f 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -294,6 +294,10 @@ group("telemetry_gpu_integration_test") {
     # For webgl_conformance
     "//third_party/webgl/",
     "//content/test/gpu/run_gpu_integration_test.py",
+
+    # For pixel_test
+    "//media/test/data/bear.mp4",
+    "//media/test/data/bear-vp9.webm",
   ]
 }