content: Add overdraw feedback support for X11 ChromeOS builds.

content/browser/compositor/mus_browser_compositor_output_surface.cc

Index: content/browser/compositor/mus_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/mus_browser_compositor_output_surface.cc b/content/browser/compositor/mus_browser_compositor_output_surface.cc
index bcd30f289aef26f1e1e31140deb4f9d0659ef3ab..32058ce694b02fa6642838dd1a24dbd59844921b 100644
--- a/content/browser/compositor/mus_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/mus_browser_compositor_output_surface.cc
@@ -32,7 +32,8 @@ MusBrowserCompositorOutputSurface::MusBrowserCompositorOutputSurface(
         overlay_candidate_validator)
     : GpuBrowserCompositorOutputSurface(std::move(context),
                                         update_vsync_parameters_callback,
-                                        std::move(overlay_candidate_validator)),
+                                        std::move(overlay_candidate_validator),
+                                        false /* support_stencil */),
       ui_window_(window),
       window_(nullptr),
       begin_frame_source_(nullptr) {
@@ -50,7 +51,8 @@ MusBrowserCompositorOutputSurface::MusBrowserCompositorOutputSurface(
         overlay_candidate_validator)
     : GpuBrowserCompositorOutputSurface(std::move(context),
                                         update_vsync_parameters_callback,
-                                        std::move(overlay_candidate_validator)),
+                                        std::move(overlay_candidate_validator),
+                                        false  /* support_stencil */),
       ui_window_(nullptr),
       window_(window),
       begin_frame_source_(nullptr) {