headless: Make it possible to configure an HTTP proxy

headless/lib/browser/headless_browser_impl.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_
 
 #include "headless/public/headless_browser.h"
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 26 matching lines @@
 
   void set_browser_main_parts(HeadlessBrowserMainParts* browser_main_parts);
   HeadlessBrowserMainParts* browser_main_parts() const;
 
   HeadlessBrowserContext* browser_context() const;
 
   void RunOnStartCallback();
 
   const HeadlessBrowser::Options& options() const { return options_; }
 
+  // Customize the options used by this headless browser instance. Note that
+  // options which take effect before the message loop has been started (e.g.,
+  // custom message pumps) cannot be set via this method.
+  void SetOptionsForTesting(const HeadlessBrowser::Options& options);
+
  protected:
   base::Callback<void(HeadlessBrowser*)> on_start_callback_;
   HeadlessBrowser::Options options_;
   HeadlessBrowserMainParts* browser_main_parts_;  // Not owned.
   scoped_ptr<aura::WindowTreeHost> window_tree_host_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessBrowserImpl);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_