[headless] Add default browser context to HeadlessBrowser.

headless/public/headless_browser.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_PUBLIC_HEADLESS_BROWSER_H_
 #define HEADLESS_PUBLIC_HEADLESS_BROWSER_H_
 
 #include <memory>
 #include <string>
 #include <unordered_map>
@@ skipping 38 matching lines @@
   // Returns the HeadlessWebContents associated with the
   // |devtools_agent_host_id| if any.  Otherwise returns null.
   virtual HeadlessWebContents* GetWebContentsForDevToolsAgentHostId(
       const std::string& devtools_agent_host_id) = 0;
 
   // Returns HeadlessBrowserContext associated with the given id if any.
   // Otherwise returns null.
   virtual HeadlessBrowserContext* GetBrowserContextForId(
       const std::string& id) = 0;
 
+  // Allows setting and getting the browser context that DevTools will create
+  // new targets in by default.
+  virtual void SetDefaultBrowserContext(
+      HeadlessBrowserContext* browser_context) = 0;
+  virtual HeadlessBrowserContext* GetDefaultBrowserContext() = 0;
+
   // Returns a task runner for submitting work to the browser file thread.
   virtual scoped_refptr<base::SingleThreadTaskRunner> BrowserFileThread()
       const = 0;
 
   // Returns a task runner for submitting work to the browser io thread.
   virtual scoped_refptr<base::SingleThreadTaskRunner> BrowserIOThread()
       const = 0;
 
   // Returns a task runner for submitting work to the browser main thread.
   virtual scoped_refptr<base::SingleThreadTaskRunner> BrowserMainThread()
@@ skipping 141 matching lines @@
 // the main loop, it will only return after HeadlessBrowser::Shutdown() is
 // called, returning the exit code for the process. It is not possible to
 // initialize the browser again after it has been torn down.
 int HeadlessBrowserMain(
     HeadlessBrowser::Options options,
     const base::Callback<void(HeadlessBrowser*)>& on_browser_start_callback);
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_HEADLESS_BROWSER_H_