cc: Implement overdraw feedback debugging feature.

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 17 matching lines @@
         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)),
       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 36 matching lines @@
 
 GLenum GpuSurfacelessBrowserCompositorOutputSurface::
     GetFramebufferCopyTextureFormat() {
   return buffer_queue_->internal_format();
 }
 
 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(
     const std::vector<ui::LatencyInfo>& latency_info,
     gfx::SwapResult result,
     const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac) {
   bool force_swap = false;
   if (result == gfx::SwapResult::SWAP_NAK_RECREATE_BUFFERS) {
     // Even through the swap failed, this is a fixable error so we can pretend
     // it succeeded to the rest of the system.
     result = gfx::SwapResult::SWAP_ACK;
     buffer_queue_->RecreateBuffers();
     force_swap = true;
   }
   buffer_queue_->PageFlipComplete();
   GpuBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
       latency_info, result, params_mac);
   if (force_swap)
     client_->SetNeedsRedrawRect(gfx::Rect(swap_size_));
 }
 
 }  // namespace content