Make Status an enum and move it from media to media.omx.

Bug: 31399200

Test: None.
Change-Id: I28a891030f24b3d9aa2938ae61bf02b060feee05

media/1.0/types.hal

@@ -23,7 +23,6 @@ import android.hardware.graphics.common@1.0::PixelFormat;
  */
 typedef handle FileDescriptor; // This must have no more than one fd.
 typedef FileDescriptor Fence;
-typedef int32_t Status; // TODO: convert to an enum
 typedef vec<uint8_t> Bytes;
 
 /**

media/omx/1.0/types.hal

@@ -21,6 +21,23 @@ import android.hardware.media@1.0::types;
 // Aliases
 typedef uint32_t BufferId;
 
+/**
+ * Ref: system/core/include/utils/Errors.h
+ * Ref: bionic/libc/kernel/uapi/asm-generic/errno-base.h
+ * Ref: bionic/libc/kernel/uapi/asm-generic/errno.h
+ * Ref: frameworks/av/include/media/stagefright/MediaError.h
+ * Ref: frameworks/av/media/libstagefright/omx/OMXUtils.cpp: StatusFromOMXError
+ */
+enum Status : int32_t {
+    OK                      = 0,
+    NO_ERROR                = 0,
+
+    NAME_NOT_FOUND          = -2,
+    NO_MEMORY               = -12,
+    ERROR_UNSUPPORTED       = -1010,
+    UNKNOWN_ERROR           = -2147483648,
+};
+
 /**
  * Ref: frameworks/av/include/media/IOMX.h: omx_message
  *