Trigger didCommitAndDrawCompositorFrame on Swapbuffers complete

content/renderer/render_widget_fullscreen_pepper.cc

Index: content/renderer/render_widget_fullscreen_pepper.cc
diff --git a/content/renderer/render_widget_fullscreen_pepper.cc b/content/renderer/render_widget_fullscreen_pepper.cc
index ce90c309f257c2938d87a85c2e620f470586e4f7..7b2df61dacb838e846311b0bce2d4c5e49b09d28 100644
--- a/content/renderer/render_widget_fullscreen_pepper.cc
+++ b/content/renderer/render_widget_fullscreen_pepper.cc
@@ -486,6 +486,10 @@ void RenderWidgetFullscreenPepper::SwapBuffers() {
   context_->Echo(base::Bind(
       &RenderWidgetFullscreenPepper::OnSwapBuffersCompleteByRendererGLContext,
       weak_ptr_factory_.GetWeakPtr()));
+
+  // The compositor isn't actually active in this path, but pretend it is for
+  // scheduling purposes.
+  didCommitAndDrawCompositorFrame();
 }
 
 void RenderWidgetFullscreenPepper::OnLostContext(