Use a resource throttle to implement shouldOverrideUrlLoading.

content/browser/android/web_contents_observer_proxy.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 "content/browser/android/web_contents_observer_proxy.h"
 
 #include <string>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 77 matching lines @@
   ScopedJavaLocalRef<jstring> jstring_url(ConvertUTF8ToJavaString(
       env, web_contents()->GetLastCommittedURL().spec()));
   Java_WebContentsObserverProxy_didStopLoading(env, obj.obj(),
                                                jstring_url.obj());
 }
 
 void WebContentsObserverProxy::DidFailProvisionalLoad(
     RenderFrameHost* render_frame_host,
     const GURL& validated_url,
     int error_code,
-    const base::string16& error_description) {
+    const base::string16& error_description,
+    bool was_ignored_by_handler) {
   DidFailLoadInternal(true, !render_frame_host->GetParent(), error_code,
-                      error_description, validated_url);
+                      error_description, validated_url, was_ignored_by_handler);
 }
 
 void WebContentsObserverProxy::DidFailLoad(
     RenderFrameHost* render_frame_host,
     const GURL& validated_url,
     int error_code,
-    const base::string16& error_description) {
+    const base::string16& error_description,
+    bool was_ignored_by_handler) {
   DidFailLoadInternal(false, !render_frame_host->GetParent(), error_code,
-                      error_description, validated_url);
+                      error_description, validated_url, was_ignored_by_handler);
 }
 
 void WebContentsObserverProxy::DidNavigateMainFrame(
     const LoadCommittedDetails& details,
     const FrameNavigateParams& params) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(java_observer_);
   ScopedJavaLocalRef<jstring> jstring_url(
       ConvertUTF8ToJavaString(env, params.url.spec()));
   ScopedJavaLocalRef<jstring> jstring_base_url(
@@ skipping 126 matching lines @@
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(java_observer_);
   Java_WebContentsObserverProxy_didChangeThemeColor(env, obj.obj(), color);
 }
 
 void WebContentsObserverProxy::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) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(java_observer_);
   ScopedJavaLocalRef<jstring> jstring_error_description(
       ConvertUTF16ToJavaString(env, description));
   ScopedJavaLocalRef<jstring> jstring_url(
       ConvertUTF8ToJavaString(env, url.spec()));
 
   Java_WebContentsObserverProxy_didFailLoad(
       env, obj.obj(), is_provisional_load, is_main_frame, error_code,
-      jstring_error_description.obj(), jstring_url.obj());
+      jstring_error_description.obj(), jstring_url.obj(),
+      was_ignored_by_handler);
 }
 
 void WebContentsObserverProxy::DidFirstVisuallyNonEmptyPaint() {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(java_observer_);
   Java_WebContentsObserverProxy_didFirstVisuallyNonEmptyPaint(env, obj.obj());
 }
 
 void WebContentsObserverProxy::DidStartNavigationToPendingEntry(
     const GURL& url,
     NavigationController::ReloadType reload_type) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj(java_observer_);
   ScopedJavaLocalRef<jstring> jstring_url(
       ConvertUTF8ToJavaString(env, url.spec()));
 
   Java_WebContentsObserverProxy_didStartNavigationToPendingEntry(
       env, obj.obj(), jstring_url.obj());
 }
 
 bool RegisterWebContentsObserverProxy(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 }  // namespace content