gpu: Keep original GMB alive to workaround problem with importing of UDL/EVDI buffers.

gpu/ipc/service/gpu_memory_buffer_factory_ozone_native_pixmap.h

Index: gpu/ipc/service/gpu_memory_buffer_factory_ozone_native_pixmap.h
diff --git a/gpu/ipc/service/gpu_memory_buffer_factory_ozone_native_pixmap.h b/gpu/ipc/service/gpu_memory_buffer_factory_ozone_native_pixmap.h
index b981a9676ca3730d8f61c4dbe88daaff93ba191d..5a132bbdaeb4ac839d8eca08362c430a067e11f8 100644
--- a/gpu/ipc/service/gpu_memory_buffer_factory_ozone_native_pixmap.h
+++ b/gpu/ipc/service/gpu_memory_buffer_factory_ozone_native_pixmap.h
@@ -5,6 +5,10 @@
 #ifndef GPU_IPC_SERVICE_GPU_MEMORY_BUFFER_FACTORY_OZONE_NATIVE_PIXMAP_H_
 #define GPU_IPC_SERVICE_GPU_MEMORY_BUFFER_FACTORY_OZONE_NATIVE_PIXMAP_H_
 
+#include <unordered_map>
+#include <utility>
+
+#include "base/hash.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
 #include "gpu/command_buffer/service/image_factory.h"
@@ -34,7 +38,7 @@ class GPU_EXPORT GpuMemoryBufferFactoryOzoneNativePixmap
       int client_id,
       SurfaceHandle surface_handle) override;
   void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
-                              int client_id) override {}
+                              int client_id) override;
   ImageFactory* AsImageFactory() override;
 
   // Overridden from ImageFactory:
@@ -47,6 +51,15 @@ class GPU_EXPORT GpuMemoryBufferFactoryOzoneNativePixmap
       SurfaceHandle surface_handle) override;
 
  private:
+  using NativePixmapMapKey = std::pair<int, int>;
+  using NativePixmapMapKeyHash = base::IntPairHash<NativePixmapMapKey>;
+  using NativePixmapMap =
+      std::unordered_map<NativePixmapMapKey,
+                         scoped_refptr<ui::NativePixmap>,
+                         NativePixmapMapKeyHash>;
+  NativePixmapMap native_pixmaps_;
+  base::Lock native_pixmaps_lock_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferFactoryOzoneNativePixmap);
 };