Figure out the default graphics card on the Browser process

ui/ozone/platform/dri/ozone_platform_dri.cc

 // Copyright 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 "ui/ozone/platform/dri/ozone_platform_dri.h"
 
 #include "base/at_exit.h"
 #include "base/thread_task_runner_handle.h"
 #include "ui/base/cursor/ozone/bitmap_cursor_factory_ozone.h"
 #include "ui/events/ozone/device/device_manager.h"
@@ skipping 31 matching lines @@
 
 namespace {
 
 // OzonePlatform for Linux DRI (Direct Rendering Infrastructure)
 //
 // This platform is Linux without any display server (no X, wayland, or
 // anything). This means chrome alone owns the display and input devices.
 class OzonePlatformDri : public OzonePlatform {
  public:
   OzonePlatformDri()
-      : dri_(new DriWrapper(GetFirstDisplayCardPath())),
+      : dri_(new DriWrapper(GetPrimaryDisplayCardPath())),
         buffer_generator_(new DriBufferGenerator()),
         screen_manager_(new ScreenManager(buffer_generator_.get())),
         device_manager_(CreateDeviceManager()),
         window_delegate_manager_() {}
   ~OzonePlatformDri() override {}
 
   // OzonePlatform:
   ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() override {
     return surface_factory_ozone_.get();
   }
@@ skipping 18 matching lines @@
     scoped_ptr<DriWindow> platform_window(
         new DriWindow(delegate, bounds, gpu_platform_support_host_.get(),
                       event_factory_ozone_.get(), cursor_.get(),
                       window_manager_.get(), display_manager_.get()));
     platform_window->Initialize();
     return platform_window.Pass();
   }
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(new NativeDisplayDelegateProxy(
         gpu_platform_support_host_.get(), device_manager_.get(),
-        display_manager_.get()));
+        display_manager_.get(), dri_->device_path()));
   }
   void InitializeUI() override {
     if (!dri_->Initialize())
       LOG(FATAL) << "Failed to initialize primary DRM device";
 
     // This makes sure that simple targets that do not handle display
     // configuration can still use the primary display.
     ForceInitializationOfPrimaryDisplay(dri_, screen_manager_.get());
     drm_device_manager_.reset(new DrmDeviceManager(dri_));
     display_manager_.reset(new DisplayManager());
@@ skipping 58 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformDri);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformDri() {
   return new OzonePlatformDri;
 }
 
 }  // namespace ui