drm_hwcomposer: extract platform-libdrm code from platform-generic

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/platform/platformlibdrm.h b/platform/platformlibdrm.h
new file mode 100644
index 0000000..abec17c
--- /dev/null
+++ b/platform/platformlibdrm.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_PLATFORM_LIBDRM_H_
+#define ANDROID_PLATFORM_LIBDRM_H_
+
+#include <hardware/gralloc.h>
+
+#include "platform.h"
+#include "platformdrmgeneric.h"
+
+namespace android {
+
+class LibdrmImporter : public DrmGenericImporter {
+ public:
+  using DrmGenericImporter::DrmGenericImporter;
+  int ConvertBoInfo(buffer_handle_t handle, hwc_drm_bo_t *bo) override;
+
+ private:
+  bool GetYuvPlaneInfo(int num_fds, buffer_handle_t handle, hwc_drm_bo_t *bo);
+};
+
+}  // namespace android
+
+#endif