PROTOTYPE: PlzNavigate: use a Mojo data pipe to stream navigation data to the renderer.

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index ed0021fba5c63cec73af9f48689359b135c24fe9..0e5f0b9afeed940cdf803cabe52d1dd550e85c90 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -10,6 +10,7 @@
 #include "content/browser/frame_host/navigator_delegate.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
+#include "mojo/public/cpp/system/data_pipe.h"
 #include "ui/base/window_open_disposition.h"
 
 class GURL;
@@ -154,6 +155,12 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
   virtual void CommitNavigation(NavigationRequest* navigation_request,
                                 ResourceResponse* response,
                                 scoped_ptr<StreamHandle> body);
+  // TODO(carlosk): there can only be one... At some point in time.
+  virtual void CommitNavigation(
+      NavigationRequest* navigation_request,
+      ResourceResponse* response,
+      mojo::ScopedDataPipeConsumerHandle data_consumer_handle,
+      int request_id);
 
   // PlzNavigate
   // Called when a NavigationRequest for |frame_tree_node| failed. An