gpu: Use mojom API for getting video memory usage.

gpu/ipc/common/BUILD.gn

Index: gpu/ipc/common/BUILD.gn
diff --git a/gpu/ipc/common/BUILD.gn b/gpu/ipc/common/BUILD.gn
index 12a0794e4440e1ba04447cc25765e20707592955..9ccc11a0ee65ef7b76b92d457348e271bbe29345 100644
--- a/gpu/ipc/common/BUILD.gn
+++ b/gpu/ipc/common/BUILD.gn
@@ -142,6 +142,7 @@ mojom("interfaces") {
     "gpu_preferences.mojom",
     "mailbox.mojom",
     "mailbox_holder.mojom",
+    "memory_stats.mojom",
     "surface_handle.mojom",
     "sync_token.mojom",
   ]
@@ -167,6 +168,7 @@ source_set("struct_traits") {
   sources = [
     "mailbox_holder_struct_traits.h",
     "mailbox_struct_traits.h",
+    "memory_stats_struct_traits.h",
     "surface_handle_struct_traits.h",
     "sync_token_struct_traits.h",
   ]
@@ -174,6 +176,7 @@ source_set("struct_traits") {
     ":interfaces_shared_cpp_sources",
     ":surface_handle_type",
     "//gpu/command_buffer/common",
+    "//gpu/ipc/common",
     "//mojo/public/cpp/bindings:bindings",
   ]
 }