Implement redirect handling on MojoAsyncResourceHandler

content/common/url_loader.mojom

Index: content/common/url_loader.mojom
diff --git a/content/common/url_loader.mojom b/content/common/url_loader.mojom
index f66e93c97371e2a7a37f7e0399a841a4801cddb4..c8d8ac3a9c50f8ce4c599ae1829dbe7aebb20a65 100644
--- a/content/common/url_loader.mojom
+++ b/content/common/url_loader.mojom
@@ -11,6 +11,9 @@ struct URLRequest;
 struct URLResponseHead;
 
 [Native]
+struct URLRequestRedirectInfo;
+
+[Native]
 struct URLLoaderStatus;
 
 // Destroying a URLLoader will cancel the associated request.
@@ -25,6 +28,10 @@ interface URLLoaderClient {
   // Called when the response head is received.
   OnReceiveResponse(URLResponseHead head);
 
+  // Called when the request has been redirected. The receiver is expected to
+  // call FollowRedirect or cancel the request.
+  OnReceiveRedirect(URLRequestRedirectInfo redirect_info, URLResponseHead head);
+
   // Called when some data from a resource request has been downloaded to the
   // file. This is only called in the 'download_to_file' case and replaces
   // OnStartLoadingResponseBody in the call sequence in that case.