cc/blimp: Add a LayerTreeHostRemote implementation.

cc/blimp/compositor_proto_state.cc

Index: cc/blimp/compositor_proto_state.cc
diff --git a/cc/test/stub_layer_tree_host_single_thread_client.cc b/cc/blimp/compositor_proto_state.cc
similarity index 50%
copy from cc/test/stub_layer_tree_host_single_thread_client.cc
copy to cc/blimp/compositor_proto_state.cc
index 028e738f698dfb3443bce5ec9c514e2b44e3fd5b..c76a763fdf896fcca49f605371c51dd6bf33d93e 100644
--- a/cc/test/stub_layer_tree_host_single_thread_client.cc
+++ b/cc/blimp/compositor_proto_state.cc
@@ -2,11 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "cc/test/stub_layer_tree_host_single_thread_client.h"
+#include "cc/blimp/compositor_proto_state.h"
+
+#include "cc/output/swap_promise.h"
 
 namespace cc {
 
-StubLayerTreeHostSingleThreadClient::~StubLayerTreeHostSingleThreadClient() =
-    default;
+CompositorProtoState::CompositorProtoState() = default;
+
+CompositorProtoState::~CompositorProtoState() = default;
 
 }  // namespace cc