headless: Allow protocol handler customization

headless/test/headless_browser_test.h

 // 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.
 
 #ifndef HEADLESS_TEST_HEADLESS_BROWSER_TEST_H_
 #define HEADLESS_TEST_HEADLESS_BROWSER_TEST_H_
 
 #include <memory>
 #include "content/public/test/browser_test_base.h"
 #include "headless/public/headless_browser.h"
 
 namespace base {
 class RunLoop;
 }
 
 namespace headless {
+namespace runtime {
+class EvaluateResult;
+}
 class HeadlessWebContents;
 
 // Base class for tests which require a full instance of the headless browser.
 class HeadlessBrowserTest : public content::BrowserTestBase {
  public:
   // Notify that an asynchronous test is now complete and the test runner should
   // exit.
   void FinishAsynchronousTest();
 
  protected:
@@ skipping 10 matching lines @@
   // pumps) cannot be set via this method.
   void SetBrowserOptions(HeadlessBrowser::Options options);
 
   // Run an asynchronous test in a nested run loop. The caller should call
   // FinishAsynchronousTest() to notify that the test should finish.
   void RunAsynchronousTest();
 
   // Synchronously waits for a tab to finish loading.
   bool WaitForLoad(HeadlessWebContents* web_contents);
 
+  // Synchronously evaluates a script and returns the result.
+  std::unique_ptr<runtime::EvaluateResult> EvaluateScript(
+      HeadlessWebContents* web_contents,
+      const std::string& script);
+
  protected:
   // Returns the browser for the test.
   HeadlessBrowser* browser() const;
 
  private:
   std::unique_ptr<base::RunLoop> run_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessBrowserTest);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_TEST_HEADLESS_BROWSER_TEST_H_