Provide default implementation for WebContentsDelegate::OpenURLFromTab.

content/public/browser/web_contents_delegate.cc

 // 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.
 
 #include "content/public/browser/web_contents_delegate.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/security_style_explanations.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/bindings_policy.h"
 #include "content/public/common/security_style.h"
 #include "content/public/common/url_constants.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace content {
 
 WebContentsDelegate::WebContentsDelegate() {
 }
 
 WebContents* WebContentsDelegate::OpenURLFromTab(WebContents* source,
                                                  const OpenURLParams& params) {
-  return nullptr;
+  // This default implementation only handles CURRENT_TAB.
+  if (params.disposition != CURRENT_TAB)
+    return nullptr;
+
+  NavigationController::LoadURLParams load_url_params(params.url);
+  load_url_params.source_site_instance = params.source_site_instance;
+  load_url_params.transition_type = params.transition;
+  load_url_params.frame_tree_node_id = params.frame_tree_node_id;
+  load_url_params.referrer = params.referrer;
+  load_url_params.redirect_chain = params.redirect_chain;
+  load_url_params.extra_headers = params.extra_headers;
+  load_url_params.is_renderer_initiated = params.is_renderer_initiated;
+  load_url_params.transferred_global_request_id =
+      params.transferred_global_request_id;
+  load_url_params.should_replace_current_entry =
+      params.should_replace_current_entry;
+
+  // Only allows the browser-initiated navigation to use POST.
+  if (params.uses_post && !params.is_renderer_initiated) {
+    load_url_params.load_type =
+        NavigationController::LOAD_TYPE_BROWSER_INITIATED_HTTP_POST;
+    load_url_params.browser_initiated_post_data =
+        params.browser_initiated_post_data;
+  }
+
+  source->GetController().LoadURLWithParams(load_url_params);
+  return source;
 }
 
 bool WebContentsDelegate::IsPopupOrPanel(const WebContents* source) const {
   return false;
 }
 
 bool WebContentsDelegate::CanOverscrollContent() const { return false; }
 
 gfx::Rect WebContentsDelegate::GetRootWindowResizerRect() const {
   return gfx::Rect();
@@ skipping 212 matching lines @@
     SecurityStyleExplanations* security_style_explanations) {
   return content::SECURITY_STYLE_UNKNOWN;
 }
 
 void WebContentsDelegate::ShowCertificateViewerInDevTools(
     WebContents* web_contents,
     int cert_id) {
 }
 
 }  // namespace content