Delegate root layer scroll offset to android_webview.

android_webview/browser/in_process_view_renderer.cc

Index: android_webview/browser/in_process_view_renderer.cc
diff --git a/android_webview/browser/in_process_view_renderer.cc b/android_webview/browser/in_process_view_renderer.cc
index 353d4c0231aa9bd6ee37cf1af69c319eedafd964..aff2868959fb5f547e06b9f229bb055897f92397 100644
--- a/android_webview/browser/in_process_view_renderer.cc
+++ b/android_webview/browser/in_process_view_renderer.cc
@@ -557,6 +557,16 @@ void InProcessViewRenderer::SetContinuousInvalidate(bool invalidate) {
   EnsureContinuousInvalidation();
 }
 
+void InProcessViewRenderer::SetTotalRootLayerScrollOffset(
+    gfx::Vector2dF new_value) {
+  // TODO(mkosiba): Plumb this all the way through to the view.
+  root_layer_scroll_offset_ = new_value;
+}
+
+gfx::Vector2dF InProcessViewRenderer::GetTotalRootLayerScrollOffset() {
+  return root_layer_scroll_offset_;
+}
+
 void InProcessViewRenderer::Invalidate() {
   continuous_invalidate_task_pending_ = false;
   if (continuous_invalidate_)