content: Add overdraw feedback support for X11 ChromeOS builds.

content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "cc/output/output_surface_client.h"
 #include "cc/output/output_surface_frame.h"
@@ skipping 13 matching lines @@
         gpu::SurfaceHandle surface_handle,
         const UpdateVSyncParametersCallback& update_vsync_parameters_callback,
         std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
             overlay_candidate_validator,
         unsigned int target,
         unsigned int internalformat,
         gfx::BufferFormat format,
         gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager)
     : GpuBrowserCompositorOutputSurface(std::move(context),
                                         update_vsync_parameters_callback,
-                                        std::move(overlay_candidate_validator)),
+                                        std::move(overlay_candidate_validator),
+                                        true  /* support_stencil */),
       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
   // presenting the back buffer, enabling the browser compositor to run ahead.
   // Surfaceless implementation acks at the time of actual buffer swap, which
   // shifts the start of the new frame forward relative to the old
   // implementation.
   capabilities_.max_frames_pending = 2;
 
   gl_helper_.reset(new display_compositor::GLHelper(
@@ skipping 65 matching lines @@
     force_swap = true;
   }
   buffer_queue_->PageFlipComplete();
   GpuBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
       latency_info, result, params_mac);
   if (force_swap)
     client_->SetNeedsRedrawRect(gfx::Rect(swap_size_));
 }
 
 }  // namespace content