Add ContentBrowserClient::OpenURL to allow tab opening wo/ WebContents.

content/public/browser/content_browser_client.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 86 matching lines @@
 class RenderFrameHost;
 class RenderProcessHost;
 class RenderViewHost;
 class ResourceContext;
 class ServiceRegistry;
 class SiteInstance;
 class SpeechRecognitionManagerDelegate;
 class WebContents;
 class WebContentsViewDelegate;
 struct MainFunctionParams;
+struct OpenURLParams;
 struct Referrer;
 struct WebPreferences;
 
 // A mapping from the scheme name to the protocol handler that services its
 // content.
 typedef std::map<
   std::string, linked_ptr<net::URLRequestJobFactory::ProtocolHandler> >
     ProtocolHandlerMap;
 
 // A scoped vector of protocol interceptors.
@@ skipping 464 matching lines @@
   // camera. Note that this does not query the user. |type| must be
   // MEDIA_DEVICE_AUDIO_CAPTURE or MEDIA_DEVICE_VIDEO_CAPTURE.
   virtual bool CheckMediaAccessPermission(BrowserContext* browser_context,
                                           const GURL& security_origin,
                                           MediaStreamType type);
 
   // Allows to override browser Mojo services exposed through the
   // RenderProcessHost.
   virtual void OverrideRenderProcessMojoServices(ServiceRegistry* registry) {}
 
+  // Allows programmatic opening of a new tab/window without going through
+  // another WebContents. For example, from a Worker.
+  virtual WebContents* OpenURL(BrowserContext* browser_context,
+                               const OpenURLParams& params);
+
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   // Populates |mappings| with all files that need to be mapped before launching
   // a child process.
   virtual void GetAdditionalMappedFilesForChildProcess(
       const base::CommandLine& command_line,
       int child_process_id,
       FileDescriptorInfo* mappings) {}
 #endif
 
 #if defined(OS_WIN)
@@ skipping 11 matching lines @@
   // Allows an embedder to provide its own ExternalVideoSurfaceContainer
   // implementation.  Return nullptr to disable external surface video.
   virtual ExternalVideoSurfaceContainer*
   OverrideCreateExternalVideoSurfaceContainer(WebContents* web_contents);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_