Add a NavigationThrottle to the public content/ interface

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 ac8402c9f6e67021004f2b746041e381c6dcac23..094e969b15dffff1a8edd63add90d9fe7168afa1 100644
--- a/content/browser/frame_host/navigator_delegate.h
+++ b/content/browser/frame_host/navigator_delegate.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
+#include <vector>
+
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
@@ -19,6 +21,7 @@ namespace content {
 
 class FrameTreeNode;
 class NavigationHandle;
+class NavigationThrottle;
 class RenderFrameHostImpl;
 struct LoadCommittedDetails;
 struct OpenURLParams;
@@ -41,6 +44,11 @@ class CONTENT_EXPORT NavigatorDelegate {
   // that |navigation_handle| will be destroyed at the end of this call.
   virtual void DidFinishNavigation(NavigationHandle* navigation_handle) {}
 
+  // Called when the network request is about to start to register the
+  // NavigationThrottles for the navigation.
+  virtual std::vector<NavigationThrottle*> AddNavigationThrottles(

[nasko, 2015/09/04 23:36:49]

As I commented elsewhere, GetNavigationThrottles, so they can be registered on
the handle.

[clamy, 2015/09/08 16:27:18]

This method no longer necessary, as the WebContents can now be accessed from the
NavigationHandle. Removed it.

+      NavigationHandle* navigation_handle);
+
   // TODO(clamy): all methods below that are related to navigation
   // events should go away in favor of the ones above.