PlzNavigate: implement process reuse for ServiceWorkers

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 55eb1ee156e9d58516b5d4eafbb640d93c2d3119..e783424656a17d35b71cc364ed6796bc55deaafe 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -715,6 +715,11 @@ void NavigationRequest::OnStartChecksComplete(
           : frame_tree_node_->current_frame_host();
   DCHECK(navigating_frame_host);
 
+  // Inform the NavigationHandle of the RenderProcessHost ID of the
+  // RenderProcessHost of the |navigating_frame_host|.
+  navigation_handle_->SetSpeculativeProcessID(
+      navigating_frame_host->GetProcess()->GetID(), !may_transfer_);

[Charlie Reis, 2017/05/15 03:41:52]

Yes, let's revisit https://codereview.chromium.org/2768813002/ or even land a
separate CL to rename may_transfer_, if you prefer.  I think this would be
another case where it's a bit hard to map the concepts onto each other.

[clamy, 2017/05/16 14:50:45]

The parameter was removed, though we should revisit
https://codereview.chromium.org/2768813002/ with a rename.

+
   BrowserContext* browser_context =
       frame_tree_node_->navigator()->GetController()->GetBrowserContext();
   StoragePartition* partition = BrowserContext::GetStoragePartition(