headless: Require the user to pass in an initial URL

headless/lib/browser/headless_web_contents_impl.cc

 // Copyright 2015 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.
 
 #include "headless/lib/browser/headless_web_contents_impl.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 13 matching lines @@
 namespace headless {
 
 class WebContentsObserverAdapter : public content::WebContentsObserver {
  public:
   WebContentsObserverAdapter(content::WebContents* web_contents,
                              HeadlessWebContents::Observer* observer)
       : content::WebContentsObserver(web_contents), observer_(observer) {}
 
   ~WebContentsObserverAdapter() override {}
 
+  void RenderViewReady() override { observer_->WebContentsReady(); }
+
   void DocumentOnLoadCompletedInMainFrame() override {
     observer_->DocumentOnLoadCompletedInMainFrame();
   }
 
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override {
     observer_->DidFinishNavigation(navigation_handle->HasCommitted() &&
                                    !navigation_handle->IsErrorPage());
   }
 
@@ skipping 59 matching lines @@
   ObserverMap::iterator it = observer_map_.find(observer);
   DCHECK(it != observer_map_.end());
   observer_map_.erase(it);
 }
 
 content::WebContents* HeadlessWebContentsImpl::web_contents() const {
   return web_contents_.get();
 }
 
 }  // namespace headless