ozone: gbm: Fail earlier if device can't be opened

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 32 matching lines @@
 
 namespace {
 
 const char kDefaultGraphicsCardPath[] = "/dev/dri/card0";
 
 class GbmBufferGenerator : public ScanoutBufferGenerator {
  public:
   GbmBufferGenerator(DriWrapper* dri)
       : dri_(dri),
         glapi_lib_(dlopen("libglapi.so.0", RTLD_LAZY | RTLD_GLOBAL)),
-        device_(gbm_create_device(dri_->get_fd())) {}
+        device_(gbm_create_device(dri_->get_fd())) {
+    if (!device_)
+      LOG(FATAL) << "Unable to initialize gbm for " << kDefaultGraphicsCardPath;
+  }
   virtual ~GbmBufferGenerator() {
     gbm_device_destroy(device_);
     if (glapi_lib_)
       dlclose(glapi_lib_);
   }
 
   gbm_device* device() const { return device_; }
 
   virtual scoped_refptr<ScanoutBuffer> Create(const gfx::Size& size) OVERRIDE {
     return GbmBuffer::CreateBuffer(
@@ skipping 67 matching lines @@
     device_manager_ = CreateDeviceManager();
     gpu_platform_support_host_.reset(new GpuPlatformSupportHostGbm());
     cursor_factory_ozone_.reset(new BitmapCursorFactoryOzone);
     cursor_.reset(new DriCursor(gpu_platform_support_host_.get()));
     event_factory_ozone_.reset(
         new EventFactoryEvdev(cursor_.get(), device_manager_.get()));
   }
 
   virtual void InitializeGPU() OVERRIDE {
     dri_.reset(new DriWrapper(kDefaultGraphicsCardPath));
+    dri_->Initialize();
     buffer_generator_.reset(new GbmBufferGenerator(dri_.get()));
     screen_manager_.reset(new ScreenManager(dri_.get(),
                                             buffer_generator_.get()));
     if (!surface_factory_ozone_)
       surface_factory_ozone_.reset(new GbmSurfaceFactory(use_surfaceless_));
 
     surface_factory_ozone_->InitializeGpu(dri_.get(),
                                           buffer_generator_->device(),
                                           screen_manager_.get(),
                                           &gpu_window_manager_);
@@ skipping 37 matching lines @@
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformGbm() {
   CommandLine* cmd = CommandLine::ForCurrentProcess();
   return new OzonePlatformGbm(cmd->HasSwitch(switches::kOzoneUseSurfaceless));
 }
 
 }  // namespace ui