Add render frame observer for CopylessPaste

components/copyless_paste/renderer/BUILD.gn

Index: components/copyless_paste/renderer/BUILD.gn
diff --git a/components/copyless_paste/renderer/BUILD.gn b/components/copyless_paste/renderer/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..8fafaed2cd690347025c25dc185ae7d63901f7ee
--- /dev/null
+++ b/components/copyless_paste/renderer/BUILD.gn
@@ -0,0 +1,16 @@
+# Copyright 2017 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.
+
+static_library("renderer") {
+  sources = [
+    "copyless_paste_agent.cc",
+    "copyless_paste_agent.h",
+  ]
+
+  deps = [
+    "//base",
+    "//content/public/renderer",
+    "//third_party/WebKit/public:blink_headers",
+  ]
+}