Add SurfaceSequence mojom file to cc/ipc and edit corresponding GYP file

cc/ipc/traits_test_service.mojom

Index: cc/ipc/traits_test_service.mojom
diff --git a/cc/ipc/traits_test_service.mojom b/cc/ipc/traits_test_service.mojom
index a88b09a769792786634cb5a3c42b3b72bdaa8456..cfe12d8983b7adbcf9c2a801878c713cc4cae4a2 100644
--- a/cc/ipc/traits_test_service.mojom
+++ b/cc/ipc/traits_test_service.mojom
@@ -9,6 +9,7 @@ import "cc/ipc/render_pass_id.mojom";
 import "cc/ipc/returned_resource.mojom";
 import "cc/ipc/shared_quad_state.mojom";
 import "cc/ipc/surface_id.mojom";
+import "cc/ipc/surface_sequence.mojom";
 import "cc/ipc/transferable_resource.mojom";
 
 // All functions on this interface echo their arguments to test StructTraits
@@ -31,6 +32,9 @@ interface TraitsTestService {
   EchoSurfaceId(SurfaceId s) => (SurfaceId pass);
 
   [Sync]
+  EchoSurfaceSequence(SurfaceSequence s) => (SurfaceSequence pass);
+
+  [Sync]
   EchoTransferableResource(TransferableResource t) =>
       (TransferableResource pass);
 };