Add MGLEcho

mojo/gles2/BUILD.gn

Index: mojo/gles2/BUILD.gn
diff --git a/mojo/gles2/BUILD.gn b/mojo/gles2/BUILD.gn
index 3824310d884dc125b2d4fc9dba2ad1fa46027982..d28e799db08999b9ac6deffd39e794f563093168 100644
--- a/mojo/gles2/BUILD.gn
+++ b/mojo/gles2/BUILD.gn
@@ -25,19 +25,20 @@ source_set("control_thunks") {
 
   deps = [
     "//base",
-    "//mojo/public/c/system",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_cmd_helper",
     "//gpu/command_buffer/client:gles2_cmd_helper_sources",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/command_buffer/common",
     "//mojo/public/c/gpu:MGL",
+    "//mojo/public/c/gpu:MGL_echo",
     "//mojo/public/c/gpu:MGL_onscreen",
     "//mojo/public/c/gpu:MGL_signal_sync_point",
+    "//mojo/public/c/system",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
-    "//services/gles2:lib",
     "//mojo/services/gpu/interfaces",
+    "//services/gles2:lib",
   ]
 }
 
@@ -61,8 +62,8 @@ source_set("gles2") {
   deps = [
     ":control_thunks",
     "//gpu/command_buffer/client:gles2_interface",
-    "//mojo/public/c/gpu:MGL",
     "//mojo/public/c/gpu:GLES2",
+    "//mojo/public/c/gpu:MGL",
   ]
 }