DevTools: reuse ephemeral port from http handler in the shell front-end.

content/shell/browser/shell_devtools_manager_delegate.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_DEVTOOLS_MANAGER_DELEGATE_H_
 #define CONTENT_SHELL_BROWSER_SHELL_DEVTOOLS_MANAGER_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "content/public/browser/devtools_manager_delegate.h"
 
 namespace content {
 
 class BrowserContext;
 
 class ShellDevToolsManagerDelegate : public DevToolsManagerDelegate {
  public:
   static void StartHttpHandler(BrowserContext* browser_context);
   static void StopHttpHandler();
+  static int GetHttpHandlerPort();
 
   explicit ShellDevToolsManagerDelegate(BrowserContext* browser_context);
   ~ShellDevToolsManagerDelegate() override;
 
   // DevToolsManagerDelegate implementation.
   void Inspect(DevToolsAgentHost* agent_host) override {}
   void DevToolsAgentStateChanged(DevToolsAgentHost* agent_host,
                                  bool attached) override {}
   base::DictionaryValue* HandleCommand(DevToolsAgentHost* agent_host,
                                        base::DictionaryValue* command) override;
   std::string GetTargetType(RenderFrameHost* host) override;
   std::string GetTargetTitle(RenderFrameHost* host) override;
   std::string GetTargetDescription(RenderFrameHost* host) override;
   scoped_refptr<DevToolsAgentHost> CreateNewTarget(const GURL& url) override;
   std::string GetDiscoveryPageHTML() override;
   std::string GetFrontendResource(const std::string& path) override;
 
  private:
   BrowserContext* browser_context_;
   DISALLOW_COPY_AND_ASSIGN(ShellDevToolsManagerDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_SHELL_DEVTOOLS_MANAGER_DELEGATE_H_