Figure out the default graphics card on the Browser process

ui/ozone/platform/dri/ozone_platform_gbm.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 "ui/ozone/platform/dri/ozone_platform_gbm.h"
 
 #include <dlfcn.h>
 #include <gbm.h>
 #include <stdlib.h>
 
@@ skipping 126 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(), primary_graphics_card_path_));
   }
   void InitializeUI() override {
+    primary_graphics_card_path_ = GetPrimaryDisplayCardPath();
     display_manager_.reset(new DisplayManager());
     // Needed since the browser process creates the accelerated widgets and that
     // happens through SFO.
     if (!surface_factory_ozone_)
       surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
     device_manager_ = CreateDeviceManager();
     gpu_platform_support_host_.reset(new DriGpuPlatformSupportHost());
     window_manager_.reset(new DriWindowManager());
     cursor_factory_ozone_.reset(new BitmapCursorFactoryOzone);
     cursor_.reset(
         new DriCursor(window_manager_.get(), gpu_platform_support_host_.get()));
     cursor_->Init();
 #if defined(USE_XKBCOMMON)
     KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(make_scoped_ptr(
         new XkbKeyboardLayoutEngine(xkb_evdev_code_converter_)));
 #else
     KeyboardLayoutEngineManager::SetKeyboardLayoutEngine(
         make_scoped_ptr(new StubKeyboardLayoutEngine()));
 #endif
     event_factory_ozone_.reset(new EventFactoryEvdev(
         cursor_.get(), device_manager_.get(),
         KeyboardLayoutEngineManager::GetKeyboardLayoutEngine()));
   }
 
   void InitializeGPU() override {
     gl_api_loader_.reset(new GlApiLoader());
     // Async page flips are supported only on surfaceless mode.
-    gbm_ = new GbmWrapper(GetFirstDisplayCardPath());
+    gbm_ = new GbmWrapper(GetPrimaryDisplayCardPath());
     if (!gbm_->Initialize())
       LOG(FATAL) << "Failed to initialize primary DRM device";
 
     drm_device_manager_.reset(new DrmDeviceManager(gbm_));
     buffer_generator_.reset(new GbmBufferGenerator());
     screen_manager_.reset(new ScreenManager(buffer_generator_.get()));
     // This makes sure that simple targets that do not handle display
     // configuration can still use the primary display.
     ForceInitializationOfPrimaryDisplay(gbm_, screen_manager_.get());
 
     window_delegate_manager_.reset(new DriWindowDelegateManager());
     if (!surface_factory_ozone_)
       surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
 
     surface_factory_ozone_->InitializeGpu(drm_device_manager_.get(),
                                           window_delegate_manager_.get());
     scoped_ptr<NativeDisplayDelegateDri> ndd(new NativeDisplayDelegateDri(
         screen_manager_.get(), gbm_,
         scoped_ptr<DrmDeviceGenerator>(new GbmDeviceGenerator())));
     gpu_platform_support_.reset(new DriGpuPlatformSupport(
         drm_device_manager_.get(), window_delegate_manager_.get(),
         screen_manager_.get(), ndd.Pass()));
   }
 
  private:
   bool use_surfaceless_;
+  base::FilePath primary_graphics_card_path_;
   scoped_ptr<GlApiLoader> gl_api_loader_;
   scoped_refptr<GbmWrapper> gbm_;
   scoped_ptr<DrmDeviceManager> drm_device_manager_;
   scoped_ptr<GbmBufferGenerator> buffer_generator_;
   scoped_ptr<ScreenManager> screen_manager_;
   scoped_ptr<DeviceManager> device_manager_;
 
   scoped_ptr<GbmSurfaceFactory> surface_factory_ozone_;
   scoped_ptr<BitmapCursorFactoryOzone> cursor_factory_ozone_;
   scoped_ptr<EventFactoryEvdev> event_factory_ozone_;
@@ skipping 19 matching lines @@
 OzonePlatform* CreateOzonePlatformGbm() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
 #if defined(USE_MESA_PLATFORM_NULL)
   // Only works with surfaceless.
   cmd->AppendSwitch(switches::kOzoneUseSurfaceless);
 #endif
   return new OzonePlatformGbm(cmd->HasSwitch(switches::kOzoneUseSurfaceless));
 }
 
 }  // namespace ui