Refactor OriginTrialPolicy to be an abstract interface in content/public/common

content/shell/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/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//media/media_options.gni")
@@ skipping 141 matching lines @@
     "common/layout_test/layout_test_content_client.h",
     "common/layout_test/layout_test_messages.cc",
     "common/layout_test/layout_test_messages.h",
     "common/layout_test/layout_test_switches.cc",
     "common/layout_test/layout_test_switches.h",
     "common/leak_detection_result.h",
     "common/shell_content_client.cc",
     "common/shell_content_client.h",
     "common/shell_messages.cc",
     "common/shell_messages.h",
+    "common/shell_origin_trial_policy.cc",
+    "common/shell_origin_trial_policy.h",
     "common/shell_switches.cc",
     "common/shell_switches.h",
     "common/shell_test_configuration.cc",
     "common/shell_test_configuration.h",
     "renderer/layout_test/blink_test_helpers.cc",
     "renderer/layout_test/blink_test_helpers.h",
     "renderer/layout_test/blink_test_runner.cc",
     "renderer/layout_test/blink_test_runner.h",
     "renderer/layout_test/layout_test_content_renderer_client.cc",
     "renderer/layout_test/layout_test_content_renderer_client.h",
@@ skipping 548 matching lines @@
       "{{bundle_resources_dir}}/{{source_file_part}}",
     ]
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom",
   ]
 }