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

mojo/system.gni

Index: mojo/system.gni
diff --git a/mojo/system.gni b/mojo/system.gni
index c7c07ad721bc38dd9e14b53c50e0c26d8930ec4a..02264432d71bd2062c71852b89acdc7ee7e12ef6 100644
--- a/mojo/system.gni
+++ b/mojo/system.gni
@@ -18,7 +18,11 @@
 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" ]
 }