Create a RegisterViewAssociate method in ViewManager

services/ui/view_manager/BUILD.gn

Index: services/ui/view_manager/BUILD.gn
diff --git a/services/ui/view_manager/BUILD.gn b/services/ui/view_manager/BUILD.gn
index b55b4292e4d0a11e449226da39d985bae2700956..6b892ceb44ed7420fd4e2aa9110471d90f900550 100644
--- a/services/ui/view_manager/BUILD.gn
+++ b/services/ui/view_manager/BUILD.gn
@@ -5,11 +5,8 @@
 import("//mojo/public/mojo_application.gni")
 import("//testing/test.gni")
 
-mojo_native_application("view_manager") {
-  output_name = "view_manager_service"
-
+source_set("common") {
   sources = [
-    "main.cc",
     "view_associate_table.cc",
     "view_associate_table.h",
     "view_container_state.cc",
@@ -32,13 +29,12 @@ mojo_native_application("view_manager") {
     "view_tree_state.h",
   ]
 
-  deps = [
+  public_deps = [
     "//base",
     "//mojo/application",
     "//mojo/common",
     "//mojo/common:tracing_impl",
     "//mojo/converters/geometry",
-    "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings:bindings",
     "//mojo/services/geometry/cpp",
     "//mojo/services/gfx/composition/cpp",
@@ -47,3 +43,40 @@ mojo_native_application("view_manager") {
     "//mojo/services/ui/views/interfaces",
   ]
 }
+
+mojo_native_application("view_manager") {
+  output_name = "view_manager_service"
+
+  sources = [
+    "main.cc",
+  ]
+
+  deps = [
+    ":common",
+    "//mojo/environment:chromium",
+  ]
+}
+
+mojo_native_application("view_manager_apptests") {
+  output_name = "view_manager_apptests"
+
+  testonly = true
+
+  sources = [
+    "tests/mock_view_associate.cc",
+    "tests/mock_view_associate.h",
+    "tests/view_associate_table_test.cc",
+    "tests/view_manager_test.cc",
+    "tests/view_manager_test_base.cc",
+    "tests/view_manager_test_base.h",
+  ]
+
+  deps = [
+    ":common",
+    "//base",
+    "//mojo/application:test_support",
+    "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/bindings:bindings",
+    "//mojo/ui/associates:mocks",
+  ]
+}