Use a resource throttle to implement shouldOverrideUrlLoading.

content/browser/android/web_contents_observer_proxy.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ANDROID_WEB_CONTENTS_OBSERVER_PROXY_H_
 #define CONTENT_BROWSER_ANDROID_WEB_CONTENTS_OBSERVER_PROXY_H_
 
 #include <jni.h>
 
 #include "base/android/jni_weak_ref.h"
@@ skipping 19 matching lines @@
   void Destroy(JNIEnv* env, jobject obj);
 
  private:
   void RenderViewReady() override;
   void RenderProcessGone(base::TerminationStatus termination_status) override;
   void DidStartLoading() override;
   void DidStopLoading() override;
   void DidFailProvisionalLoad(RenderFrameHost* render_frame_host,
                               const GURL& validated_url,
                               int error_code,
-                              const base::string16& error_description) override;
+                              const base::string16& error_description,
+                              bool was_ignored_by_handler) override;
   void DidFailLoad(RenderFrameHost* render_frame_host,
                    const GURL& validated_url,
                    int error_code,
-                   const base::string16& error_description) override;
+                   const base::string16& error_description,
+                   bool was_ignored_by_handler) override;
   void DidNavigateMainFrame(const LoadCommittedDetails& details,
                             const FrameNavigateParams& params) override;
   void DidNavigateAnyFrame(RenderFrameHost* render_frame_host,
                            const LoadCommittedDetails& details,
                            const FrameNavigateParams& params) override;
   void DocumentAvailableInMainFrame() override;
   void DidFirstVisuallyNonEmptyPaint() override;
   void DidStartProvisionalLoadForFrame(RenderFrameHost* render_frame_host,
                                        const GURL& validated_url,
                                        bool is_error_page,
@@ skipping 12 matching lines @@
   void DidDetachInterstitialPage() override;
   void DidChangeThemeColor(SkColor color) override;
   void DidStartNavigationToPendingEntry(
       const GURL& url,
       NavigationController::ReloadType reload_type) override;
 
   void DidFailLoadInternal(bool is_provisional_load,
                            bool is_main_frame,
                            int error_code,
                            const base::string16& description,
-                           const GURL& url);
+                           const GURL& url,
+                           bool was_ignored_by_handler);
 
   base::android::ScopedJavaGlobalRef<jobject> java_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserverProxy);
 };
 
 bool RegisterWebContentsObserverProxy(JNIEnv* env);
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_WEB_CONTENTS_OBSERVER_PROXY_H_