Impl mus::mojom::GpuService to enable using Chrome IPC version gpu CmdBuf in mus

components/mus/public/cpp/BUILD.gn

Index: components/mus/public/cpp/BUILD.gn
diff --git a/components/mus/public/cpp/BUILD.gn b/components/mus/public/cpp/BUILD.gn
index f785a6feecb8066fe7b44c502f19ac381d15b3f9..ab77790b7bd76bc6962d30c405b12d85f1fc74f7 100644
--- a/components/mus/public/cpp/BUILD.gn
+++ b/components/mus/public/cpp/BUILD.gn
@@ -2,15 +2,65 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("cpp") {
+component("cpp") {
+  output_name = "mus_public_cpp"
+
+  deps = [
+    ":sources",
+  ]
+
+  public_deps = [
+    ":headers",
+  ]
+}
+
+source_set("headers") {
   sources = [
     "context_provider.h",
     "gles2_context.h",
+    "gpu_service.h",
     "input_event_handler.h",
+    "mus_public_export",
+    "output_surface.h",
+    "property_type_converters.h",
+    "scoped_window_ptr.h",
+    "window.h",
+    "window_manager_delegate.h",
+    "window_observer.h",
+    "window_property.h",
+    "window_surface.h",
+    "window_surface_client.h",
+    "window_tracker.h",
+    "window_tree_connection.h",
+    "window_tree_connection_observer.h",
+    "window_tree_delegate.h",
+    "window_tree_host_factory.h",
+  ]
+
+  deps = [
+    "//cc",
+    "//cc/surfaces:surface_id",
+    "//components/mus/common:mus_common",
+    "//gpu/command_buffer/client",
+    "//gpu/command_buffer/client:gles2_implementation",
+    "//gpu/ipc/client",
+    "//services/shell/public/interfaces",
+  ]
+
+  public_deps = [
+    "../interfaces",
+  ]
+}
+
+source_set("sources") {
+  sources = [
     "lib/command_buffer_client_impl.cc",
     "lib/command_buffer_client_impl.h",
     "lib/context_provider.cc",
     "lib/gles2_context.cc",
+    "lib/gpu_memory_buffer_manager_mus.cc",
+    "lib/gpu_memory_buffer_manager_mus.h",
+    "lib/gpu_service.cc",
     "lib/in_flight_change.cc",
     "lib/in_flight_change.h",
     "lib/output_surface.cc",
@@ -25,23 +75,12 @@ source_set("cpp") {
     "lib/window_tree_client_impl.h",
     "lib/window_tree_delegate.cc",
     "lib/window_tree_host_factory.cc",
-    "output_surface.h",
-    "property_type_converters.h",
-    "scoped_window_ptr.h",
-    "window.h",
-    "window_manager_delegate.h",
-    "window_observer.h",
-    "window_property.h",
-    "window_surface.h",
-    "window_surface_client.h",
-    "window_tracker.h",
-    "window_tree_connection.h",
-    "window_tree_connection_observer.h",
-    "window_tree_delegate.h",
-    "window_tree_host_factory.h",
   ]
 
+  defines = [ "MUS_PUBLIC_IMPLEMENTATION" ]
+
   public_deps = [
+    ":headers",
     "../interfaces",
   ]
 
@@ -52,6 +91,7 @@ source_set("cpp") {
     "//cc/surfaces:surface_id",
     "//components/mus/common:mus_common",
     "//components/mus/gles2:lib",
+    "//components/mus/public/interfaces",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_cmd_helper",
     "//gpu/command_buffer/client:gles2_implementation",
@@ -60,6 +100,7 @@ source_set("cpp") {
     "//mojo/converters/geometry",
     "//mojo/converters/input_events",
     "//mojo/converters/surfaces",
+    "//mojo/public/c/system:for_component",
     "//mojo/public/cpp/bindings:bindings",
     "//mojo/public/cpp/system",
     "//services/shell/public/cpp",