Use mus::MojoGpuMemoryBufferManager in mus::GpuService.

components/mus/common/BUILD.gn

Index: components/mus/common/BUILD.gn
diff --git a/components/mus/common/BUILD.gn b/components/mus/common/BUILD.gn
index b6fc647b998d6c7c277f89fae98cddb630e88ade..ff4e61bd4e26570101bdc95065cd4db6f019542a 100644
--- a/components/mus/common/BUILD.gn
+++ b/components/mus/common/BUILD.gn
@@ -13,8 +13,18 @@ component("mus_common") {
     "event_param_traits.cc",
     "event_param_traits.h",
     "event_param_traits_macros.h",
+    "gpu_memory_buffer_impl.cc",
+    "gpu_memory_buffer_impl.h",
+    "gpu_service.cc",
+    "gpu_service.h",
     "gpu_type_converters.cc",
     "gpu_type_converters.h",
+    "mojo_buffer_backing.cc",
+    "mojo_buffer_backing.h",
+    "mojo_gpu_memory_buffer.cc",
+    "mojo_gpu_memory_buffer.h",
+    "mojo_gpu_memory_buffer_manager.cc",
+    "mojo_gpu_memory_buffer_manager.h",
     "mus_common_export.h",
     "switches.cc",
     "switches.h",
@@ -27,10 +37,13 @@ component("mus_common") {
 
   deps = [
     "//components/mus/public/interfaces",
+    "//gpu/command_buffer/client",
     "//gpu/config",
+    "//gpu/ipc/client",
     "//gpu/ipc/common:command_buffer_traits",
     "//ipc:ipc",
     "//mojo/public/c/system:for_component",
+    "//services/shell/public/cpp",
     "//ui/events:events",
     "//ui/gfx/ipc/geometry",
   ]