PROTOTYPE: PlzNavigate: use a Mojo data pipe to stream navigation data to the renderer.

content/common/render_frame_setup.mojom

Index: content/common/render_frame_setup.mojom
diff --git a/content/common/render_frame_setup.mojom b/content/common/render_frame_setup.mojom
index abe4f652f32b0c82ade400148aa4e8d48f5af409..2b167bc5120ce55eba5ecd7c27db106d99adee12 100644
--- a/content/common/render_frame_setup.mojom
+++ b/content/common/render_frame_setup.mojom
@@ -11,3 +11,9 @@ interface RenderFrameSetup {
                            mojo.ServiceProvider& services,
                            mojo.ServiceProvider exposed_services);
 };
+
+
+// MOVE THIS SOMEWHERE ELSE? NEW FILE?
+interface DataPipeConsumerHandleReceiver {
+  ReceiveDataPipeConsumerHandle(handle<data_pipe_consumer> data_consumer_handle, int32 handle_commit_id);
+};