Add tab reparenting

chrome/browser/android/tab_android.cc

 // Copyright 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 "chrome/browser/android/tab_android.h"
 
 #include <stddef.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
@@ skipping 416 matching lines @@
   CHECK_EQ(GetProfile()->IsOffTheRecord(), incognito);
 
   InstantService* instant_service =
       InstantServiceFactory::GetForProfile(GetProfile());
   if (instant_service)
     instant_service->AddObserver(this);
 
   content_layer_->InsertChild(content_view_core->GetLayer(), 0);
 }
 
+void TabAndroid::UpdateDelegates(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj,
+    const JavaParamRef<jobject>& jweb_contents_delegate,
+    const JavaParamRef<jobject>& jcontext_menu_populator) {
+  ContextMenuHelper::FromWebContents(web_contents())->SetPopulator(
+      jcontext_menu_populator);
+  web_contents_delegate_.reset(
+      new chrome::android::TabWebContentsDelegateAndroid(
+          env, jweb_contents_delegate));
+  web_contents_delegate_->LoadProgressChanged(web_contents(), 0);

[gone, 2016/02/24 18:40:37]

What happens if the tab is reparented while the tab is loading?  Setting this to
0 seems incorrect.

+  web_contents()->SetDelegate(web_contents_delegate_.get());
+}
+
 void TabAndroid::DestroyWebContents(JNIEnv* env,
                                     const JavaParamRef<jobject>& obj,
                                     jboolean delete_native) {
   DCHECK(web_contents());
 
   content::ContentViewCore* content_view_core = GetContentViewCore();
   if (content_view_core)
     content_view_core->GetLayer()->RemoveFromParent();
 
   notification_registrar_.Remove(
@@ skipping 470 matching lines @@
 static void Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   TRACE_EVENT0("native", "TabAndroid::Init");
   // This will automatically bind to the Java object and pass ownership there.
   new TabAndroid(env, obj);
 }
 
 // static
 bool TabAndroid::RegisterTabAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }