Delegate root layer scroll offset to android_webview.

android_webview/browser/in_process_renderer/in_process_view_renderer.cc

Index: android_webview/browser/in_process_renderer/in_process_view_renderer.cc
diff --git a/android_webview/browser/in_process_renderer/in_process_view_renderer.cc b/android_webview/browser/in_process_renderer/in_process_view_renderer.cc
index 98344619498f7d626d9e1b3f9e448b1dee43a697..1c9850c87e86dc37e23b91b683bf413ecc4d2219 100644
--- a/android_webview/browser/in_process_renderer/in_process_view_renderer.cc
+++ b/android_webview/browser/in_process_renderer/in_process_view_renderer.cc
@@ -404,6 +404,16 @@ 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;
   client_->Invalidate();