Implement a ResourceThrottle for URL overriding in Chrome on Android.

net/url_request/url_request.h

Index: net/url_request/url_request.h
diff --git a/net/url_request/url_request.h b/net/url_request/url_request.h
index 1bae37da4a2c86e2c39df80cd0cdccc250be0137..54a11ea91036d470cba810738290d516d9cca299 100644
--- a/net/url_request/url_request.h
+++ b/net/url_request/url_request.h
@@ -537,6 +537,9 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe),
   // request.
   void CancelWithSSLError(int error, const SSLInfo& ssl_info);
 
+  // Cancels the requests and sets the status to HANDLED_EXTERNALLY.
+  void CancelWithHandledExternallyStatus();

[darin (slow to review), 2012/05/29 23:39:32]

It looks like this may actually be moving in the wrong direction code-wise.  The
network stack really has no need to know about the HANDLED_EXTERNALLY bit.  It
is only the WebURLLoaderImpl that needs to see this bit so that the navigation
can be suppressed on the WebKit side.

I think that instead of teaching src/net/ about HANDLED_EXTERNALLY more, we
should just rip that out entirely.  We should probably remove HANDLED_EXTERNALLY
from URLRequestStatus, and we should invent a new data structure for conveying
network response status information to the WebURLLoaderImpl.

Sorry to add more work, but I think it was always a mistake to have this
HANDLED_EXTERNALLY flag defined in the network stack.  It doesn't need to know
about this flag.

+
   // Read initiates an asynchronous read from the response, and must only
   // be called after the OnResponseStarted callback is received with a
   // successful status.
@@ -684,9 +687,9 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe),
   // been orphaned.
   void OrphanJob();
 
-  // Cancels the request and set the error and ssl info for this request to the
-  // passed values.
-  void DoCancel(int error, const SSLInfo& ssl_info);
+  // Cancels the request and set the status and ssl info for this request to
+  // the passed values.
+  void DoCancel(const URLRequestStatus& status, const SSLInfo& ssl_info);
 
   // Notifies the network delegate that the request has been completed.
   // This does not imply a successful completion. Also a canceled request is