Build services as standalone executables

services/ui/BUILD.gn

Index: services/ui/BUILD.gn
diff --git a/services/ui/BUILD.gn b/services/ui/BUILD.gn
index 416f4750287eaead64fac46798ca1dcf1cb30c93..f8d88227ac86e4d7227d4d4ada39448cd63f8a8d 100644
--- a/services/ui/BUILD.gn
+++ b/services/ui/BUILD.gn
@@ -24,6 +24,7 @@ service("ui") {
   ]
 
   deps = [
+    ":copy_gl_libraries",
     ":lib",
     ":resources_100",
     ":resources_200",
@@ -32,11 +33,8 @@ service("ui") {
     "//services/tracing/public/interfaces",
   ]
 
-  if (is_win) {
-    deps += [ ":copy_gl_libraries" ]
-  }
-
   data_deps = [
+    ":copy_gl_libraries",
     ":manifest",
     "//services/ui/ime/test_ime_driver",
   ]
@@ -53,9 +51,13 @@ service_manifest("manifest") {
   source = "manifest.json"
 }
 
-if (is_win) {
-  copy("copy_gl_libraries") {
-    deps = [
+copy("copy_gl_libraries") {
+  deps = [
+    "//third_party/mesa:osmesa",
+  ]
+
+  if (is_win) {
+    deps += [
       "//third_party/angle:libEGL",
       "//third_party/angle:libGLESv2",
     ]
@@ -63,12 +65,19 @@ if (is_win) {
     sources = [
       "$root_shlib_dir/libEGL.dll",
       "$root_shlib_dir/libGLESv2.dll",
+      "$root_shlib_dir/osmesa.dll",
     ]
-
-    outputs = [
-      "$root_out_dir/$packages_directory/ui/{{source_file_part}}",
+  } else if (is_android || is_linux) {
+    sources = [
+      "$root_shlib_dir/libosmesa.so",
     ]
+  } else {
+    sources = []
   }
+
+  outputs = [
+    "$root_out_dir/$packages_directory/ui/{{source_file_part}}",
+  ]
 }
 
 source_set("lib") {