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

chrome/browser/devtools/devtools_target_impl.h

Index: chrome/browser/devtools/devtools_target_impl.h
diff --git a/chrome/browser/devtools/devtools_target_impl.h b/chrome/browser/devtools/devtools_target_impl.h
index 2fe0b8e871611432e09bbc2991b273efc3f93e40..6322a3af6f43c0d4ebe9b4a4fda1d5f4e8813eaf 100644
--- a/chrome/browser/devtools/devtools_target_impl.h
+++ b/chrome/browser/devtools/devtools_target_impl.h
@@ -20,9 +20,40 @@
 
 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();