Navigation transitions: Block first response until after transitions have run.

content/browser/android/web_contents_observer_android.cc

Index: content/browser/android/web_contents_observer_android.cc
diff --git a/content/browser/android/web_contents_observer_android.cc b/content/browser/android/web_contents_observer_android.cc
index 72b22417d1185a9a1cb1c4a81ede0904333410fb..1dd850762e79d729f63823b6d7a60f5808f1eb35 100644
--- a/content/browser/android/web_contents_observer_android.cc
+++ b/content/browser/android/web_contents_observer_android.cc
@@ -95,6 +95,14 @@ void WebContentsObserverAndroid::DidStopLoading(
       env, obj.obj(), jstring_url.obj());
 }
 
+void WebContentsObserverAndroid::DidDeferAfterResponseStarted() {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj(weak_java_observer_.get(env));
+  if (obj.is_null())
+    return;
+  Java_WebContentsObserverAndroid_didDeferAfterResponseStarted(env, obj.obj());
+}
+
 void WebContentsObserverAndroid::DidFailProvisionalLoad(
     int64 frame_id,
     const base::string16& frame_unique_name,