Ensure GPU try bots are invoked for GpuVideoDecoder changes.

This includes all of filters/ but primarily we want this for any
GpuVideoDecoder changes. Many of the other things in filters/ are
related to VDA/GVD processing, so just include them all.

There doesn't seem to be a PostUploadHook which allows you to
filter based on files anyways...

BUG=none
TEST=none

Change-Id: I53cb8d74ec9bff4152e6bac87e0047410cc58f72
Reviewed-on: https://chromium-review.googlesource.com/567722Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486149}

media/filters/PRESUBMIT.py

+# Copyright (c) 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.
+
+"""Top-level presubmit script for media/filters/.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools.
+"""
+
+def PostUploadHook(cl, change, output_api):
+  """git cl upload will call this hook after the issue is created/modified.
+
+  This hook modifies the CL description in order to run extra GPU
+  tests (in particular, the WebGL 2.0 conformance tests) in addition
+  to the regular CQ try bots. This test suite is too large to run
+  against all Chromium commits, but should be run against changes
+  likely to affect these tests.
+  """
+  return output_api.EnsureCQIncludeTrybotsAreAdded(
+    cl,
+    [
+      'master.tryserver.chromium.linux:linux_optional_gpu_tests_rel',
+      'master.tryserver.chromium.mac:mac_optional_gpu_tests_rel',
+      'master.tryserver.chromium.win:win_optional_gpu_tests_rel',
+      'master.tryserver.chromium.android:android_optional_gpu_tests_rel',
+    ],
+    'Automatically added optional GPU tests to run on CQ.')