cc: Implement overdraw feedback debugging feature.

content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc

Index: content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc b/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
index 60f84290cdf9c040d739f003851b86797c8e51eb..517ed066cb927cd4fda91ff93667848df486d0b7 100644
--- a/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
@@ -35,6 +35,7 @@ GpuSurfacelessBrowserCompositorOutputSurface::
       gpu_memory_buffer_manager_(gpu_memory_buffer_manager) {
   capabilities_.uses_default_gl_framebuffer = false;
   capabilities_.flipped_output_surface = true;
+  capabilities_.supports_stencil = true;
   // Set |max_frames_pending| to 2 for surfaceless, which aligns scheduling
   // more closely with the previous surfaced behavior.
   // With a surface, swap buffer ack used to return early, before actually
@@ -91,12 +92,13 @@ void GpuSurfacelessBrowserCompositorOutputSurface::Reshape(
     const gfx::Size& size,
     float device_scale_factor,
     const gfx::ColorSpace& color_space,
-    bool has_alpha) {
+    bool has_alpha,
+    bool use_stencil) {
   reshape_size_ = size;
-  GpuBrowserCompositorOutputSurface::Reshape(size, device_scale_factor,
-                                             color_space, has_alpha);
+  GpuBrowserCompositorOutputSurface::Reshape(
+      size, device_scale_factor, color_space, has_alpha, use_stencil);
   DCHECK(buffer_queue_);
-  buffer_queue_->Reshape(size, device_scale_factor, color_space);
+  buffer_queue_->Reshape(size, device_scale_factor, color_space, use_stencil);
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(