PlzNavigate: support the WebRequest API

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index 048554c4e9c7c38fb2f59e88d854b2d762a7937e..1c17171151562176fc71e569b58b9f1d21bcc665 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -27,6 +27,7 @@ struct FrameHostMsg_DidCommitProvisionalLoad_Params;
 
 namespace content {
 
+class NavigationUIData;
 class NavigatorDelegate;
 class ResourceRequestBodyImpl;
 
@@ -232,6 +233,10 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
 
   SSLStatus ssl_status() { return ssl_status_; }
 
+  NavigationUIData* navigation_ui_data() const {
+    return navigation_ui_data_.get();
+  }
+
  private:
   friend class NavigationHandleImplTest;
 
@@ -323,11 +328,15 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // This callback will be run when all throttle checks have been performed.
   ThrottleChecksFinishedCallback complete_callback_;
 
-  // Embedder data tied to this navigation.
+  // Embedder data from the IO thread tied to this navigation.
   std::unique_ptr<NavigationData> navigation_data_;
 
   SSLStatus ssl_status_;
 
+  // PlzNavigate
+  // Embedder data from the UI thread tied to this navigation.
+  std::unique_ptr<NavigationUIData> navigation_ui_data_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);
 };