Delegate root layer scroll offset to android_webview.

content/renderer/gpu/input_handler_manager.cc

Index: content/renderer/gpu/input_handler_manager.cc
diff --git a/content/renderer/gpu/input_handler_manager.cc b/content/renderer/gpu/input_handler_manager.cc
index aeff90e16fd70af99c798ae3cda591122ce5c59a..8d54e46ee0a3fbb0b4a80f705677675ff92bc885 100644
--- a/content/renderer/gpu/input_handler_manager.cc
+++ b/content/renderer/gpu/input_handler_manager.cc
@@ -72,6 +72,15 @@ void InputHandlerManager::AddInputHandlerOnCompositorThread(
           routing_id, main_loop, input_handler, render_view_impl));
 }
 
+void InputHandlerManager::SetRootLayerScrollDelegate(
+      int routing_id,
+      cc::LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
+  DCHECK(message_loop_proxy_->BelongsToCurrentThread());
+
+  input_handlers_[routing_id]->input_handler_proxy()
+      ->SetRootLayerScrollOffsetDelegate(root_layer_scroll_offset_delegate);
+}
+
 void InputHandlerManager::RemoveInputHandler(int routing_id) {
   DCHECK(message_loop_proxy_->BelongsToCurrentThread());