Add flag to make vda_unittest input paths relative to media/test/data

media/gpu/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/gpu/args.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
@@ skipping 347 matching lines @@
 
     data = [
       "//media/test/data/",
     ]
 
     deps = [
       ":gpu",
       "//base",
       "//base/test:test_support",
       "//media",
+      "//media/base:test_support",
       "//testing/gtest",
       "//ui/base",
       "//ui/display/manager",
       "//ui/gfx",
       "//ui/gfx:test_support",
       "//ui/gfx/geometry",
       "//ui/gl",
       "//ui/gl:test_support",
       "//ui/gl/init",
     ]
@@ skipping 128 matching lines @@
       "video_accelerator_unittest_helpers.h",
     ]
     if (use_x11) {
       deps += [ "//ui/gfx/x" ]
     }
     if (use_ozone) {
       deps += [ "//ui/ozone" ]
     }
   }
 }