Implement transfer navigation with mojo

content/browser/loader/mojo_async_resource_handler.h

Index: content/browser/loader/mojo_async_resource_handler.h
diff --git a/content/browser/loader/mojo_async_resource_handler.h b/content/browser/loader/mojo_async_resource_handler.h
index ae47419a9565684db5a487f06858ed51221d318c..264516ae7655460b8422e3c98adfb603557deab5 100644
--- a/content/browser/loader/mojo_async_resource_handler.h
+++ b/content/browser/loader/mojo_async_resource_handler.h
@@ -12,6 +12,7 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/common/content_export.h"
@@ -41,6 +42,10 @@ class CONTENT_EXPORT MojoAsyncResourceHandler
     : public ResourceHandler,
       public NON_EXPORTED_BASE(mojom::URLLoader) {
  public:
+  using TransferCallback =
+      base::Callback<void(mojom::URLLoaderAssociatedRequest,
+                          mojom::URLLoaderClientAssociatedPtr)>;
+
   MojoAsyncResourceHandler(
       net::URLRequest* request,
       ResourceDispatcherHostImpl* rdh,
@@ -48,6 +53,8 @@ class CONTENT_EXPORT MojoAsyncResourceHandler
       mojom::URLLoaderClientAssociatedPtr url_loader_client);
   ~MojoAsyncResourceHandler() override;
 
+  TransferCallback GetTransferCallback();
+
   // ResourceHandler implementation:
   bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
                            ResourceResponse* response,
@@ -93,6 +100,9 @@ class CONTENT_EXPORT MojoAsyncResourceHandler
   // This function can be overriden only for tests.
   virtual void ReportBadMessage(const std::string& error);
 
+  void OnTransfer(mojom::URLLoaderAssociatedRequest mojo_request,
+                  mojom::URLLoaderClientAssociatedPtr url_loader_client);
+
   ResourceDispatcherHostImpl* rdh_;
   mojo::AssociatedBinding<mojom::URLLoader> binding_;
 
@@ -112,6 +122,7 @@ class CONTENT_EXPORT MojoAsyncResourceHandler
   size_t buffer_bytes_read_ = 0;
   scoped_refptr<SharedWriter> shared_writer_;
 
+  base::WeakPtrFactory<MojoAsyncResourceHandler> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(MojoAsyncResourceHandler);
 };