PlzNavigate: support the WebRequest API

content/public/browser/resource_request_info.h

Index: content/public/browser/resource_request_info.h
diff --git a/content/public/browser/resource_request_info.h b/content/public/browser/resource_request_info.h
index 37a8c8ef8fd1fb0af81a4b886154e68b43dc4e64..c3c803f63a15036d9a23a09ac45f04622d14d869 100644
--- a/content/public/browser/resource_request_info.h
+++ b/content/public/browser/resource_request_info.h
@@ -17,6 +17,7 @@ class URLRequest;
 }
 
 namespace content {
+class NavigationUIData;
 class ResourceContext;
 class WebContents;
 
@@ -152,6 +153,11 @@ class ResourceRequestInfo {
   // Whether this request if using Lo-Fi mode.
   virtual bool IsUsingLoFi() const = 0;
 
+  // PlzNavigate
+  // Only used for main resources. Returns opaque data set by the embedder on

[nasko, 2016/09/22 18:32:50]

What is "main resource"? What about subframe navigations, aren't those covered?

[clamy, 2016/09/26 15:37:51]

I meant the load of the main resource of each frame (including subframe).
Switched to using navigation which is less confusing.

+  // the UI thread at the beginning of navigation.
+  virtual NavigationUIData* GetNavigationUIData() const = 0;
+
  protected:
   virtual ~ResourceRequestInfo() {}
 };