GN: Mojo wget, sample_app, surfaces app and component build

mojo/examples/echo/BUILD.gn

Index: mojo/examples/echo/BUILD.gn
diff --git a/mojo/examples/echo/BUILD.gn b/mojo/examples/echo/BUILD.gn
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index 0000000000000000000000000000000000000000..ad666702bc2e3ae0226db4a3391ab9316e7550b0
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+++ b/mojo/examples/echo/BUILD.gn
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+# Copyright 2014 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.
+
+import("//mojo/public/tools/bindings/mojom.gni")
+import("//mojo/system.gni")
+
+group("echo") {
+  deps = [
+    ":client",
+    ":service"
+  ]
+}
+
+# GYP version: mojo/mojo_examples.gypi:mojo_echo_client
+shared_library("client") {
+  output_name = "mojo_echo_client"
+
+  deps = [
+    ":bindings",
+    "//mojo/public/cpp/application:main_standalone",
+    "//mojo/public/cpp/application:standalone",
+    "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/environment:standalone",
+    "//mojo/public/cpp/utility",
+  ]
+  deps += mojo_system_for_shared_library
+
+  sources = [ "echo_client.cc" ]
+}
+
+# GYP version: mojo/mojo_examples.gypi:mojo_echo_service
+shared_library("service") {
+  output_name = "mojo_echo_service"
+
+  deps = [
+    ":bindings",
+    "//mojo/public/cpp/application:main_standalone",
+    "//mojo/public/cpp/application:standalone",
+    "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/environment:standalone",
+    "//mojo/public/cpp/utility",
+  ]
+  deps += mojo_system_for_shared_library
+
+  sources = [ "echo_service.cc" ]
+}
+
+# GYP version: mojo/mojo_examples.gypi:mojo_echo_service_bindings
+mojom("bindings") {
+  sources = [ "echo_service.mojom" ]
+}