Add GN isolate support for a bunch of unittests.

ui/compositor/BUILD.gn

 # Copyright 2014 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/ui.gni")
 import("//testing/test.gni")
 
 component("compositor") {
   sources = [
     "canvas_painter.cc",
@@ skipping 136 matching lines @@
   }
 
   if (use_ozone) {
     sources += [ "test/test_compositor_host_ozone.cc" ]
   } else if (use_x11) {
     sources += [ "test/test_compositor_host_x11.cc" ]
   }
 }
 
 if (!is_android) {
+  # TODO(GYP): Delete this after we've converted everything to GN.
+  # The _run targets exist only for compatibility w/ GYP.
+  group("compositor_unittests_run") {
+    testonly = true
+    deps = [
+      ":compositor_unittests",
+    ]
+  }
+
   test("compositor_unittests") {
     sources = [
       "compositor_unittest.cc",
       "layer_animation_element_unittest.cc",
       "layer_animation_sequence_unittest.cc",
       "layer_animator_unittest.cc",
       "layer_owner_unittest.cc",
       "layer_unittest.cc",
       "run_all_unittests.cc",
       "transform_animation_curve_adapter_unittest.cc",
     ]
 
+    data = [
+      "//ui/gfx/test/data/compositor/",
+    ]
+
     deps = [
       ":compositor",
       ":test_support",
       "//base",
       "//base/allocator",
       "//base/test:test_support",
       "//cc",
       "//cc:test_support",
       "//skia",
       "//testing/gmock",
       "//testing/gtest",
       "//ui/base",
       "//ui/gfx",
       "//ui/gfx/geometry",
       "//ui/gl",
       "//ui/resources",
     ]
 
     if (is_linux) {
       deps += [ "//third_party/mesa:osmesa" ]
     }
   }
 }