[DevTools] Expose DevToolsAgentHost for OOPIF, display it in chrome://inspect.

chrome/browser/devtools/devtools_window.h

Index: chrome/browser/devtools/devtools_window.h
diff --git a/chrome/browser/devtools/devtools_window.h b/chrome/browser/devtools/devtools_window.h
index d0a4d3b0b2f6fa4f1ef40cdb3f906126713899a2..ed6b166fbe462c7cab29b80f6d8b90ad75d3f6eb 100644
--- a/chrome/browser/devtools/devtools_window.h
+++ b/chrome/browser/devtools/devtools_window.h
@@ -72,6 +72,11 @@ class DevToolsWindow : public DevToolsUIBindings::Delegate,
   static DevToolsWindow* OpenDevToolsWindow(
       content::WebContents* inspected_web_contents);
 
+  // Open or reveal DevTools window. This window will be undocked.
+  static DevToolsWindow* OpenDevToolsWindow(
+      Profile* profile,
+      const scoped_refptr<content::DevToolsAgentHost>& agent_host);
+
   // Perform specified action for current WebContents inside a |browser|.
   // This may close currently open DevTools window.
   static DevToolsWindow* ToggleDevToolsWindow(