Add tab reparenting

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 80157cef7d3c36fc67944ffc230da12c4b826458..7343ae679e7bc3ce3d26a0bdcfb207cdbee714a2 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -434,6 +434,20 @@ void TabAndroid::InitWebContents(
   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) {