headless: Make it possible to configure an HTTP proxy

headless/lib/browser/headless_browser_impl.cc

 // 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.
 
 #include "headless/lib/browser/headless_browser_impl.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "content/public/app/content_main.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 56 matching lines @@
 
 void HeadlessBrowserImpl::RunOnStartCallback() {
   DCHECK(aura::Env::GetInstance());
   window_tree_host_.reset(aura::WindowTreeHost::Create(gfx::Rect()));
   window_tree_host_->InitHost();
 
   on_start_callback_.Run(this);
   on_start_callback_ = base::Callback<void(HeadlessBrowser*)>();
 }
 
+void HeadlessBrowserImpl::SetOptionsForTesting(
+    const HeadlessBrowser::Options& options) {
+  options_ = options;
+  browser_context()->SetOptionsForTesting(options);
+}
+
 int HeadlessBrowserMain(
     const HeadlessBrowser::Options& options,
     const base::Callback<void(HeadlessBrowser*)>& on_browser_start_callback) {
   scoped_ptr<HeadlessBrowserImpl> browser(
       new HeadlessBrowserImpl(on_browser_start_callback, options));
 
   // TODO(skyostil): Implement custom message pumps.
   DCHECK(!options.message_pump);
 
   headless::HeadlessContentMainDelegate delegate(std::move(browser));
   content::ContentMainParams params(&delegate);
   params.argc = options.argc;
   params.argv = options.argv;
   return content::ContentMain(params);
 }
 
 }  // namespace headless