Enable features API for content shell and webview

content/shell/browser/shell_browser_main_parts.h

 // Copyright 2013 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 CONTENT_SHELL_BROWSER_SHELL_BROWSER_MAIN_PARTS_H_
 #define CONTENT_SHELL_BROWSER_SHELL_BROWSER_MAIN_PARTS_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
@@ skipping 21 matching lines @@
 
 namespace content {
 
 class ShellBrowserMainParts : public BrowserMainParts {
  public:
   explicit ShellBrowserMainParts(const MainFunctionParams& parameters);
   ~ShellBrowserMainParts() override;
 
   // BrowserMainParts overrides.
   void PreEarlyInitialization() override;
+  int PreCreateThreads() override;
   void PreMainMessageLoopStart() override;
   void PostMainMessageLoopStart() override;
   void PreMainMessageLoopRun() override;
   bool MainMessageLoopRun(int* result_code) override;
   void PostMainMessageLoopRun() override;
   void PostDestroyThreads() override;
 
   devtools_http_handler::DevToolsHttpHandler* devtools_http_handler() {
     return devtools_http_handler_.get();
   }
@@ skipping 29 matching lines @@
   bool run_message_loop_;
 
   scoped_ptr<devtools_http_handler::DevToolsHttpHandler> devtools_http_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserMainParts);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_SHELL_BROWSER_MAIN_PARTS_H_