Make multi-gpu tests independent of intermittent display changes on OSX

content/browser/gpu/gpu_data_manager_impl_private.cc

 // Copyright (c) 2013 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_data_manager_impl_private.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 914 matching lines @@
   // Notify observers in the browser process.
   ui::GpuSwitchingManager::GetInstance()->NotifyGpuSwitched();
   // Pass the notification to the GPU process to notify observers there.
   GpuProcessHost::SendOnIO(GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
                            CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
                            new GpuMsg_GpuSwitched);
 }
 
 bool GpuDataManagerImplPrivate::UpdateActiveGpu(uint32_t vendor_id,
                                                 uint32_t device_id) {
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+
+  // For tests, only the gpu process is allowed to detect the active gpu device
+  // using information on the actual loaded GL driver.
+  if (command_line->HasSwitch(switches::kGpuTestingVendorId) &&
+      command_line->HasSwitch(switches::kGpuTestingDeviceId)) {
+    return false;
+  }
+
   if (gpu_info_.gpu.vendor_id == vendor_id &&
       gpu_info_.gpu.device_id == device_id) {
     // The primary GPU is active.
     if (gpu_info_.gpu.active)
       return false;
     gpu_info_.gpu.active = true;
     for (size_t ii = 0; ii < gpu_info_.secondary_gpus.size(); ++ii)
       gpu_info_.secondary_gpus[ii].active = false;
   } else {
     // A secondary GPU is active.
@@ skipping 326 matching lines @@
   gpu_info_.context_info_state = gpu::kCollectInfoFatalFailure;
 #if defined(OS_WIN)
   gpu_info_.dx_diagnostics_info_state = gpu::kCollectInfoFatalFailure;
 #endif
   complete_gpu_info_already_requested_ = true;
   // Some observers might be waiting.
   NotifyGpuInfoUpdate();
 }
 
 }  // namespace content