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

mojo/system.gni

 # 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.
 
 # The following mojo_system-prefixed variables are used to express a dependency
 # on the mojo system APIs.
 #
 # In an is_component_build build, everything can link against
 # mojo_system_impl because it is built as a shared library. However, in a static
 # build, mojo_system_impl is linked into an executable (e.g.,
 # mojo_shell), and must be injected into other shared libraries (i.e., Mojo
 # Apps) that need the mojo system API.
 #
 # For component targets, add mojo_system_for_component to your deps section.
 # For shared_library targets (e.g., a Mojo App), add
 # mojo_system_for_shared_library to your deps
 
 if (is_component_build) {
   mojo_system_for_component = [ "//mojo/system" ]
   mojo_system_for_shared_library = [ "//mojo/system" ]
+  mojo_gles2_for_component = [ "//mojo/gles2" ]
+  mojo_gles2_for_shared_library = [ "//mojo/gles2" ]
 } else {
   mojo_system_for_component = [] # nothing to link against here
   mojo_system_for_shared_library = [ "//mojo/public/c/system" ]
+  mojo_gles2_for_component = []
+  mojo_gles2_for_shared_library = [ "//mojo/public/gles2" ]
 }