cc/blimp: Add a LayerTreeHostRemote implementation.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a8b247940b60181cfdcf9a048e64141df275ecf8
--- /dev/null
+++ b/cc/trees/layer_tree_host.cc
@@ -0,0 +1,19 @@
+// Copyright 2016 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.
+
+#include "cc/trees/layer_tree_host.h"
+
+#include "base/atomic_sequence_num.h"
+
+namespace cc {
+namespace {
+static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
+}  // namespace
+
+// static
+int LayerTreeHost::GenerateHostId() {
+  return s_layer_tree_host_sequence_number.GetNext() + 1;
+}
+
+}  // namespace cc