Disable BeginFrame scheduling for OOPIF

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 1835121df0d180053a0ccf3d88218f6cb70dce8e..3b4b3b34c476f6a81a684994bd26382b6cb248e6 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -221,8 +221,6 @@ void RenderWidgetCompositor::Initialize() {
 
   settings.throttle_frame_production =
       !cmd->HasSwitch(switches::kDisableGpuVsync);
-  settings.use_external_begin_frame_source =
-      cmd->HasSwitch(switches::kEnableBeginFrameScheduling);
   settings.main_frame_before_activation_enabled =
       cmd->HasSwitch(cc::switches::kEnableMainFrameBeforeActivation) &&
       !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeActivation);
@@ -235,6 +233,12 @@ void RenderWidgetCompositor::Initialize() {
     settings.use_compositor_animation_timelines = true;
     blink::WebRuntimeFeatures::enableCompositorAnimationTimelines(true);
   }
+  if (cmd->HasSwitch(switches::kEnableBeginFrameScheduling) &&
+      !widget_->for_oopif()) {
+    // TODO(simonhong): Apply BeginFrame scheduling for OOPIF.
+    // See crbug.com/471411.
+    settings.use_external_begin_frame_source = true;
+  }
 
   settings.default_tile_size = CalculateDefaultTileSize(widget_);
   if (cmd->HasSwitch(switches::kDefaultTileWidth)) {