[Ozone-Dri] Gracefully handle DRM devices with no resources

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 78 matching lines @@
 
 class GbmDeviceGenerator : public DrmDeviceGenerator {
  public:
   GbmDeviceGenerator() {}
   ~GbmDeviceGenerator() override {}
 
   // DrmDeviceGenerator:
   scoped_refptr<DriWrapper> CreateDevice(const base::FilePath& path,
                                          base::File file) override {
     scoped_refptr<DriWrapper> drm = new GbmWrapper(path, file.Pass());
-    drm->Initialize();
-    return drm;
+    if (drm->Initialize())
+      return drm;
+
+    return nullptr;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GbmDeviceGenerator);
 };
 
 class OzonePlatformGbm : public OzonePlatform {
  public:
   OzonePlatformGbm(bool use_surfaceless) : use_surfaceless_(use_surfaceless) {
   }
@@ skipping 55 matching lines @@
 #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_->Initialize();
+    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_));
@@ skipping 42 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