Mac Overlays: Add sandwich strategy

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 "cc/output/compositor_frame.h"
 #include "content/browser/compositor/browser_compositor_overlay_candidate_validator.h"
 #include "content/browser/compositor/buffer_queue.h"
 #include "content/browser/compositor/reflector_impl.h"
@@ skipping 38 matching lines @@
   output_surface_.reset(new BufferQueue(
       context_provider_, target, internalformat_, gl_helper_.get(),
       gpu_memory_buffer_manager_, surface_id));
   output_surface_->Initialize();
 }
 
 GpuSurfacelessBrowserCompositorOutputSurface::
     ~GpuSurfacelessBrowserCompositorOutputSurface() {
 }
 
+unsigned GpuSurfacelessBrowserCompositorOutputSurface::GetOverlayTextureId()
+    const {
+  return output_surface_->current_texture_id();
+}
+
 void GpuSurfacelessBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   DCHECK(output_surface_);
 
   GLuint texture = output_surface_->current_texture_id();
   output_surface_->SwapBuffers(frame->gl_frame_data->sub_buffer_rect);
   const gfx::Size& size = frame->gl_frame_data->size;
   context_provider_->ContextGL()->ScheduleOverlayPlaneCHROMIUM(
       0,
       GL_OVERLAY_TRANSFORM_NONE_CHROMIUM,
@@ skipping 45 matching lines @@
 #endif
 }
 
 #if defined(OS_MACOSX)
 void GpuSurfacelessBrowserCompositorOutputSurface::OnSurfaceDisplayed() {
   OnSwapBuffersComplete();
 }
 #endif
 
 }  // namespace content