ozone: drm: Fix graphics buffer handle leak in DrmConsoleBuffer

ui/ozone/platform/drm/test/mock_drm_device.h

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_DRM_TEST_MOCK_DRM_DEVICE_H_
 #define UI_OZONE_PLATFORM_DRM_TEST_MOCK_DRM_DEVICE_H_
 
 #include <map>
 #include <queue>
 #include <vector>
@@ skipping 88 matching lines @@
                  const gfx::Size& size) override;
   bool MoveCursor(uint32_t crtc_id, const gfx::Point& point) override;
   bool CreateDumbBuffer(const SkImageInfo& info,
                         uint32_t* handle,
                         uint32_t* stride,
                         void** pixels) override;
   void DestroyDumbBuffer(const SkImageInfo& info,
                          uint32_t handle,
                          uint32_t stride,
                          void* pixels) override;
+
+  bool CloseBufferHandle(uint32_t handle) override;
   bool CommitProperties(drmModePropertySet* properties,
                         uint32_t flags,
                         const PageFlipCallback& callback) override;
 
  private:
   ~MockDrmDevice() override;
 
   int get_crtc_call_count_;
   int set_crtc_call_count_;
   int restore_crtc_call_count_;
@@ skipping 18 matching lines @@
   std::map<uint32_t, uint32_t> crtc_cursor_map_;
 
   std::queue<PageFlipCallback> callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(MockDrmDevice);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_TEST_MOCK_DRM_DEVICE_H_