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 ff454817e90db7a7c98e4c87d2857304a894d38f..c321a6d5e1062bb045124596b5e6d795cc523e79 100644
--- a/android_webview/browser/in_process_view_renderer.cc
+++ b/android_webview/browser/in_process_view_renderer.cc
@@ -569,6 +569,16 @@ void InProcessViewRenderer::SetContinuousInvalidate(bool invalidate) {
   EnsureContinuousInvalidation();
 }
 
+void InProcessViewRenderer::SetTotalRootLayerScrollOffset(
+    gfx::Vector2dF new_value) {
+  // TODO(mkosiba): Plumb this all the way through to the view.
+  scroll_offset_ = new_value;
+}
+
+gfx::Vector2dF InProcessViewRenderer::GetTotalRootLayerScrollOffset() {
+  return scroll_offset_;
+}
+
 void InProcessViewRenderer::Invalidate() {
   continuous_invalidate_task_pending_ = false;
   if (continuous_invalidate_)