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

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index 84cc93f4ccf585d896080434989b8b100eee7c3f..4ebdc2743d46606987aafdbfab1d885556500a4e 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -265,8 +265,11 @@ void NavigationRequest::OnRequestRedirected(
 
 void NavigationRequest::OnResponseStarted(
     const scoped_refptr<ResourceResponse>& response,
-    scoped_ptr<StreamHandle> body) {
+    mojo::ScopedDataPipeConsumerHandle data_consumer_handle,
+    int request_id) {
   DCHECK(state_ == STARTED);
+  DCHECK(data_consumer_handle.is_valid());
+  DCHECK_LT(request_id, -1);
   state_ = RESPONSE_STARTED;
 
   // Update the service worker params of the request params.
@@ -286,7 +289,7 @@ void NavigationRequest::OnResponseStarted(
     common_params_.lofi_state = LOFI_OFF;
 
   frame_tree_node_->navigator()->CommitNavigation(
-      this, response.get(), std::move(body));
+      this, response.get(), std::move(data_consumer_handle), request_id);
 }
 
 void NavigationRequest::OnRequestFailed(bool has_stale_copy_in_cache,