PlzNavigate: support the WebRequest API

content/browser/frame_host/navigator_delegate.h

Index: content/browser/frame_host/navigator_delegate.h
diff --git a/content/browser/frame_host/navigator_delegate.h b/content/browser/frame_host/navigator_delegate.h
index ca08298430c15d7d3d9ea6719fa4d74c14c22935..0f435bf643339603ddd98a914c2c2ef0917bf2cc 100644
--- a/content/browser/frame_host/navigator_delegate.h
+++ b/content/browser/frame_host/navigator_delegate.h
@@ -10,6 +10,7 @@
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_throttle.h"
+#include "content/public/browser/navigation_ui_data.h"
 #include "content/public/browser/reload_type.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/base/window_open_disposition.h"
@@ -140,6 +141,14 @@ class CONTENT_EXPORT NavigatorDelegate {
   // where no NavigationThrottles are added to the navigation.
   virtual ScopedVector<NavigationThrottle> CreateThrottlesForNavigation(
       NavigationHandle* navigation_handle);
+
+  // PlzNavigate
+  // Called at the start of the navigation to get opaque data the embedder
+  // wants to see passed to the corresponding URLRequest on the IO thread.
+  // In the case of a navigation to an interstitial, no call will be made to the
+  // embedder and |nullptr| is returned.
+  virtual std::unique_ptr<NavigationUIData> GetNavigationUIData(
+      NavigationHandle* navigation_handle);
 };
 
 }  // namspace content