Implement a runtime headless mode for Linux

content/browser/compositor/gpu_process_transport_factory.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_process_transport_factory.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 37 matching lines @@
 #include "gpu/command_buffer/common/mailbox.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
 #include "services/service_manager/runner/common/client_util.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_constants.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/compositor/layer.h"
 #include "ui/display/types/display_snapshot.h"
 #include "ui/gfx/geometry/size.h"
+#include "ui/gfx/switches.h"
 
 #if defined(USE_AURA)
 #include "content/browser/compositor/mus_browser_compositor_output_surface.h"
 #include "content/public/common/service_manager_connection.h"
 #include "ui/aura/window_tree_host.h"
 #endif
 
 #if defined(OS_WIN)
 #include "content/browser/compositor/software_output_device_win.h"
 #include "ui/gfx/win/rendering_window_manager.h"
@@ skipping 121 matching lines @@
 
   // Make sure the lost context callback doesn't try to run during destruction.
   callback_factory_.InvalidateWeakPtrs();
 
   task_graph_runner_->Shutdown();
 }
 
 std::unique_ptr<cc::SoftwareOutputDevice>
 GpuProcessTransportFactory::CreateSoftwareOutputDevice(
     ui::Compositor* compositor) {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kHeadless))
+    return base::WrapUnique(new cc::SoftwareOutputDevice);
+
 #if defined(USE_AURA)
   if (service_manager::ServiceManagerIsRemote()) {
     NOTREACHED();
     return nullptr;
   }
 #endif
 
 #if defined(OS_WIN)
   return std::unique_ptr<cc::SoftwareOutputDevice>(
       new SoftwareOutputDeviceWin(software_backing_.get(), compositor));
@@ skipping 44 matching lines @@
   }
 #elif defined(OS_ANDROID)
   validator.reset(
       new display_compositor::CompositorOverlayCandidateValidatorAndroid());
 #endif
 
   return validator;
 }
 
 static bool ShouldCreateGpuCompositorFrameSink(ui::Compositor* compositor) {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kHeadless))
+    return false;
+
 #if defined(OS_CHROMEOS)
   // Software fallback does not happen on Chrome OS.
   return true;
 #endif
   if (IsUsingMus())
     return true;
 
 #if defined(OS_WIN)
   if (::GetProp(compositor->widget(), kForceSoftwareCompositor) &&
       ::RemoveProp(compositor->widget(), kForceSoftwareCompositor))
@@ skipping 607 matching lines @@
       shared_vulkan_context_provider_ =
           cc::VulkanInProcessContextProvider::Create();
     }
 
     shared_vulkan_context_provider_initialized_ = true;
   }
   return shared_vulkan_context_provider_;
 }
 
 }  // namespace content