Implement improvements for request handling (issue #1327).

- Add a new CefRequestHandler::OnResourceResponse() method for inspecting the request/response headers and potentially restarting or redirecting the request.
- Add a new CefRequest::GetIdentifier() method for tracking a request across multiple CefRequestHandler callbacks.
- Pass a CefRequest object instead of just the old URL to CefRequestHandler::OnResourceRedirect().

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@2073 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

patch/patches/net_urlrequest_1327.patch

@@ -0,0 +1,16 @@
+diff --git url_request.h url_request.h
+index 1623368..16d292d 100644
+--- url_request.h
++++ url_request.h
+@@ -609,10 +609,10 @@ class NET_EXPORT URLRequest : NON_EXPORTED_BASE(public base::NonThreadSafe),
+     return proxy_server_;
+   }
+ 
+- protected:
+   // Allow the URLRequestJob class to control the is_pending() flag.
+   void set_is_pending(bool value) { is_pending_ = value; }
+ 
++ protected:
+   // Allow the URLRequestJob class to set our status too
+   void set_status(const URLRequestStatus& value) { status_ = value; }
+