Revert of DevTools: merge devtools target with devtools host, part 1

chrome/browser/devtools/devtools_target_impl.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 CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGET_IMPL_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGET_IMPL_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "components/devtools_discovery/basic_target_descriptor.h"
 
 class Profile;
 
 namespace content {
 class DevToolsAgentHost;
 class WebContents;
 }
 
 class DevToolsTargetImpl : public devtools_discovery::BasicTargetDescriptor {
  public:
+  static const char kTargetTypeApp[];
+  static const char kTargetTypeBackgroundPage[];
+  static const char kTargetTypePage[];
+  static const char kTargetTypeWorker[];
+  static const char kTargetTypeWebView[];
+  static const char kTargetTypeIFrame[];
+  static const char kTargetTypeNode[];
+  static const char kTargetTypeOther[];
+  static const char kTargetTypeServiceWorker[];
+
   explicit DevToolsTargetImpl(
       scoped_refptr<content::DevToolsAgentHost> agent_host);
   ~DevToolsTargetImpl() override;
 
+  // Returns the WebContents associated with the target on NULL if there is
+  // not any.
+  content::WebContents* GetWebContents() const;
+
+  // Returns the tab id if the target is associated with a tab, -1 otherwise.
+  virtual int GetTabId() const;
+
+  // Returns the extension id if the target is associated with an extension
+  // background page.
+  virtual std::string GetExtensionId() const;
+
+  // Open a new DevTools window or activate the existing one.
+  virtual void Inspect(Profile* profile) const;
+
+  // Reload the target page.
+  virtual void Reload() const;
+
+  // Creates a new target associated with tab.
+  static std::unique_ptr<DevToolsTargetImpl> CreateForTab(
+      content::WebContents* web_contents);
+
   // Caller takes ownership of returned objects.
   static std::vector<DevToolsTargetImpl*> EnumerateAll();
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGET_IMPL_H_