Ntp: restore scroll position.

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_string.h"
@@ skipping 642 matching lines @@
   std::string url;
   if (jurl)
     url = base::android::ConvertJavaStringToUTF8(env, jurl);
 
   content::NavigationEntry* entry =
       web_contents()->GetController().GetVisibleEntry();
   if (entry && url == entry->GetVirtualURL().spec())
     entry->SetTitle(title);
 }
 
+void TabAndroid::SetLastCommittedNavigationEntryExtraData(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj,
+    const JavaParamRef<jstring>& jkey,
+    const JavaParamRef<jstring>& jvalue) {
+  DCHECK(web_contents());
+
+  std::string key;
+  if (jkey)

[Bernhard Bauer, 2016/09/16 15:02:50]

I don't think we expect either of these to be null.

[Michael van Ouwerkerk, 2016/09/16 16:35:05]

Done.

+    key = base::android::ConvertJavaStringToUTF8(env, jkey);
+
+  base::string16 value;
+  if (jvalue)
+    value = base::android::ConvertJavaStringToUTF16(env, jvalue);
+
+  content::NavigationEntry* entry =
+      web_contents()->GetController().GetLastCommittedEntry();
+  if (entry)
+    entry->SetExtraData(key, value);
+}
+
 bool TabAndroid::Print(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   if (!web_contents())
     return false;
 
   printing::PrintViewManagerBasic::CreateForWebContents(web_contents());
   printing::PrintViewManagerBasic* print_view_manager =
       printing::PrintViewManagerBasic::FromWebContents(web_contents());
   if (print_view_manager == NULL)
     return false;
 
@@ skipping 245 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);
 }