build: Add missing copyright headers to new GN build files
BUG=21339022
Change-Id: I946fad7bf8116054f9081e064748793e79a6f85a
diff --git a/BUILD.gn b/BUILD.gn
index 1af5ea4..10cefaa 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1,3 +1,25 @@
+#
+# Copyright (C) 2015 Google, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# This is the root build file for GN. GN will start processing by loading this
+# file, and recursively load all dependencies until all dependencies are either
+# resolved or known not to exist (which will cause the build to fail). So if
+# you add a new build file, there must be some path of dependencies from this
+# file to your new one or GN won't know about it.
+
# This pulls in main/BUILD.gn and all of its dependencies.
group("bluetooth") {
deps = [