cc:: Add remote mode to the compositor

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 3be4ebb9b3d28848b32687f46e4b15cac4b73044..0bca23952f10d2f461616a8d61c1a1a0d3826b0a 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -506,6 +506,13 @@ component("cc") {
     "trees/proxy_impl.h",
     "trees/proxy_main.cc",
     "trees/proxy_main.h",
+    "trees/remote_channel_host.cc",
+    "trees/remote_channel_host.h",
+    "trees/remote_channel_host_client.h",
+    "trees/remote_channel_impl.cc",
+    "trees/remote_channel_impl.h",
+    "trees/remote_channel_main.cc",
+    "trees/remote_channel_main.h",
     "trees/remote_proto_channel.h",
     "trees/scoped_abort_remaining_swap_promises.h",
     "trees/single_thread_proxy.cc",
@@ -659,6 +666,10 @@ source_set("test_support") {
     "test/proxy_impl_for_test.h",
     "test/proxy_main_for_test.cc",
     "test/proxy_main_for_test.h",
+    "test/remote_channel_impl_for_test.cc",
+    "test/remote_channel_impl_for_test.h",
+    "test/remote_proto_channel_bridge.cc",
+    "test/remote_proto_channel_bridge.h",
     "test/render_pass_test_utils.cc",
     "test/render_pass_test_utils.h",
     "test/scheduler_test_common.cc",
@@ -712,6 +723,7 @@ source_set("test_support") {
     "//base",
     "//base/test:test_support",
     "//base/third_party/dynamic_annotations",
+    "//cc/proto",
     "//cc/surfaces",
     "//cc/surfaces:surface_id",
     "//gpu/command_buffer/client:gl_in_process_context",
@@ -887,6 +899,7 @@ test("cc_unittests") {
     "trees/occlusion_tracker_unittest.cc",
     "trees/occlusion_unittest.cc",
     "trees/property_tree_unittest.cc",
+    "trees/remote_channel_unittest.cc",
     "trees/threaded_channel_unittest.cc",
     "trees/tree_synchronizer_unittest.cc",