Set GPU rasterization trigger for OOPIFs

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

Index: third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
index fe976466ae0b2ff3f3e91d42f7b8f12331eecd26..ae69e130b10a0f9fdf81937dcb99b5b2b688924c 100644
--- a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
+++ b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
@@ -1074,6 +1074,14 @@ void WebFrameWidgetImpl::InitializeLayerTreeView() {
   if (layer_tree_view_) {
     GetPage()->LayerTreeViewInitialized(*layer_tree_view_,
                                         local_root_->GetFrame()->View());
+
+    // TODO(kenrb): Currently GPU rasterization is always enabled for OOPIFs.
+    // This is okay because it is only necessarily to set the trigger to false
+    // for certain cases that affect the top-level frame, but it would be better
+    // to be consistent with the top-level frame. Ideally the logic should
+    // be moved from WebViewImpl into WebFrameWidget and used for all local
+    // frame roots. https://crbug.com/712794
+    layer_tree_view_->HeuristicsForGpuRasterizationUpdated(true);
   }
 
   // FIXME: only unittests, click to play, Android priting, and printing (for