Hide location bar on WebKit programmatic scroll.

components/web_contents_delegate_android/web_contents_delegate_android.cc

Index: components/web_contents_delegate_android/web_contents_delegate_android.cc
diff --git a/components/web_contents_delegate_android/web_contents_delegate_android.cc b/components/web_contents_delegate_android/web_contents_delegate_android.cc
index debb7b2a20e56cee0c5340bbd85ecf6107a773fe..c46e689d7084377709bbae9f04febe1da793e854 100644
--- a/components/web_contents_delegate_android/web_contents_delegate_android.cc
+++ b/components/web_contents_delegate_android/web_contents_delegate_android.cc
@@ -300,6 +300,21 @@ bool WebContentsDelegateAndroid::IsFullscreenForTabOrPending(
       env, obj.obj());
 }
 
+void WebContentsDelegateAndroid::RequestShowTopControls(
+    WebContents* web_contents, bool show) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> content_view_core =
+      content::ContentViewCore::FromWebContents(web_contents)->GetJavaObject();
+  if (content_view_core.is_null())
+    return;
+  ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
+  if (obj.is_null())
+    return;
+  Java_WebContentsDelegateAndroid_requestShowTopControls(
+      env, obj.obj(), content_view_core.obj(), show);
+}
+
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------