Make --enable-delegated-renderer show stuff on Mac

content/browser/gpu/gpu_process_host.cc

 // Copyright (c) 2012 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/gpu/gpu_process_host.h"
 
 #include "base/base64.h"
 #include "base/base_switches.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 782 matching lines @@
 
 #if defined(OS_MACOSX)
 void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
   TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped");
 
   if (!ui::LatencyInfo::Verify(params.latency_info,
                                "GpuHostMsg_AcceleratedSurfaceBuffersSwapped"))
     return;
 
+  gfx::AcceleratedWidget native_widget =
+      GpuSurfaceTracker::Get()->AcquireNativeWidget(params.surface_id);
+  if (native_widget) {
+    RenderWidgetHelper::OnNativeSurfaceBuffersSwapped(params);

[ccameron, 2014/05/06 00:20:32]

We may want to move this to a place higher up in the layer cake -- this
currently leans on the existing CompositingIOSurface code to display (which has
all sorts of stuff hanging around for tab capture). We can get away with
something much more light-weight now that tab-capture goes through the ÜC
mechanisms.

[piman, 2014/05/06 00:59:01]

Definitely not for this patch, but I'm hoping we can rework things to create the
IOSurface on the browser side, managed by a mac-specific OutputSurface, using it
as an explicit texture/FBO via the existing TexImageIOSurface2DCHROMIUM, and
then completely remove the AcceleratedSurfaceBuffersSwapped IPCs.

+    return;
+  }
+
   gfx::GLSurfaceHandle surface_handle =
       GpuSurfaceTracker::Get()->GetSurfaceHandle(params.surface_id);
   // Compositor window is always gfx::kNullPluginWindow.
   // TODO(jbates) http://crbug.com/105344 This will be removed when there are no
   // plugin windows.
   if (surface_handle.handle != gfx::kNullPluginWindow ||
       surface_handle.transport_type == gfx::TEXTURE_TRANSPORT) {
     RouteOnUIThread(GpuHostMsg_AcceleratedSurfaceBuffersSwapped(params));
     return;
   }
@@ skipping 243 matching lines @@
   TRACE_EVENT0("gpu", "GpuProcessHost::OnCacheShader");
   ClientIdToShaderCacheMap::iterator iter =
       client_id_to_shader_cache_.find(client_id);
   // If the cache doesn't exist then this is an off the record profile.
   if (iter == client_id_to_shader_cache_.end())
     return;
   iter->second->Cache(GetShaderPrefixKey() + ":" + key, shader);
 }
 
 }  // namespace content