[headless] Make browser service manifest overlay configurable.

headless/test/headless_browser_test.cc

 // Copyright 2016 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/test/headless_browser_test.h"
 
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 133 matching lines @@
            content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance()) {
     i.GetCurrentValue()->FastShutdownIfPossible();
   }
 }
 
 HeadlessBrowser* HeadlessBrowserTest::browser() const {
   return HeadlessContentMainDelegate::GetInstance()->browser();
 }
 
+HeadlessBrowser::Options* HeadlessBrowserTest::options() const {
+  return HeadlessContentMainDelegate::GetInstance()->browser()->options();
+}
+
 bool HeadlessBrowserTest::WaitForLoad(HeadlessWebContents* web_contents) {
   SynchronousLoadObserver load_observer(this, web_contents);
   RunAsynchronousTest();
   return load_observer.navigation_succeeded();
 }
 
 std::unique_ptr<runtime::EvaluateResult> HeadlessBrowserTest::EvaluateScript(
     HeadlessWebContents* web_contents,
     const std::string& script) {
   EvaluateHelper helper(this, web_contents, script);
@@ skipping 36 matching lines @@
 
   web_contents_->GetDevToolsTarget()->DetachClient(devtools_client_.get());
   web_contents_->RemoveObserver(this);
   web_contents_->Close();
   web_contents_ = nullptr;
   browser_context_->Close();
   browser_context_ = nullptr;
 }
 
 }  // namespace headless