Implement a runtime headless mode for Linux

gpu/ipc/service/gpu_init.cc

 // Copyright 2016 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 "gpu/ipc/service/gpu_init.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/trace_event/trace_event.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/config/gpu_driver_bug_list.h"
 #include "gpu/config/gpu_info_collector.h"
 #include "gpu/config/gpu_switches.h"
 #include "gpu/config/gpu_util.h"
 #include "gpu/ipc/service/gpu_watchdog_thread.h"
 #include "gpu/ipc/service/switches.h"
+#include "ui/gfx/switches.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/init/gl_factory.h"
 
 namespace gpu {
 
 namespace {
 
 void GetGpuInfoFromCommandLine(gpu::GPUInfo& gpu_info,
                                const base::CommandLine& command_line) {
@@ skipping 90 matching lines @@
     gpu::GpuDriverBugList::AppendWorkaroundsFromCommandLine(&workarounds,
                                                             command_line);
     gpu::InitializeDualGpusIfSupported(workarounds);
   }
 
   // In addition to disabling the watchdog if the command line switch is
   // present, disable the watchdog on valgrind because the code is expected
   // to run slowly in that case.
   bool enable_watchdog =
       !command_line.HasSwitch(switches::kDisableGpuWatchdog) &&
+      !command_line.HasSwitch(switches::kHeadless) &&
       !RunningOnValgrind();
 
   // Disable the watchdog in debug builds because they tend to only be run by
   // developers who will not appreciate the watchdog killing the GPU process.
 #ifndef NDEBUG
   enable_watchdog = false;
 #endif
 
   bool delayed_watchdog_enable = false;
 
@@ skipping 90 matching lines @@
     watchdog_thread_ = gpu::GpuWatchdogThread::Create();
   }
 
   if (!gpu_info_.sandboxed)
     gpu_info_.sandboxed =
         sandbox_helper_->EnsureSandboxInitialized(watchdog_thread_.get());
   return true;
 }
 
 }  // namespace gpu