Split ThreadProxy methods to ProxyMain and ProxyImpl.

cc/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("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 467 matching lines @@
     "trees/occlusion.cc",
     "trees/occlusion.h",
     "trees/occlusion_tracker.cc",
     "trees/occlusion_tracker.h",
     "trees/property_tree.cc",
     "trees/property_tree.h",
     "trees/property_tree_builder.cc",
     "trees/property_tree_builder.h",
     "trees/proxy.cc",
     "trees/proxy.h",
+    "trees/proxy_common.cc",
+    "trees/proxy_common.h",
     "trees/proxy_impl.h",
     "trees/proxy_main.h",
     "trees/scoped_abort_remaining_swap_promises.h",
     "trees/single_thread_proxy.cc",
     "trees/single_thread_proxy.h",
     "trees/swap_promise_monitor.cc",
     "trees/swap_promise_monitor.h",
     "trees/thread_proxy.cc",
     "trees/thread_proxy.h",
     "trees/threaded_channel.cc",
@@ skipping 421 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.