Add tokens for EGL_EXT_image_dma_buf_import_modifiers

Extension bug:

  https://cvs.khronos.org/bugzilla/show_bug.cgi?id=16036

Introspection entry points in spec are work in progress, but the tokens
are allocated and final.

BUG=chrome-os-partner:56407

Change-Id: I690ae770df5eb08d976ffa6a5e0cb576d5e3319a
Reviewed-on: https://chromium-review.googlesource.com/387178
Reviewed-by: Ray Smith <Raymond.Smith@arm.com>
Reviewed-by: Stphane Marchesin <marcheu@chromium.org>
Tested-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Trybot-Ready: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/397841
Commit-Ready: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
diff --git a/include/EGL/eglext.h b/include/EGL/eglext.h
index 59649a1..3332e7f 100644
--- a/include/EGL/eglext.h
+++ b/include/EGL/eglext.h
@@ -520,6 +520,21 @@
 #define EGL_YUV_CHROMA_SITING_0_5_EXT     0x3285
 #endif /* EGL_EXT_image_dma_buf_import */
 
+#ifndef EGL_EXT_image_dma_buf_import_modifiers
+#define EGL_EXT_image_dma_buf_import_modifiers
+#define EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT 0x3443
+#define EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT 0x3444
+#define EGL_DMA_BUF_PLANE1_MODIFIER_LO_EXT 0x3445
+#define EGL_DMA_BUF_PLANE1_MODIFIER_HI_EXT 0x3446
+#define EGL_DMA_BUF_PLANE2_MODIFIER_LO_EXT 0x3447
+#define EGL_DMA_BUF_PLANE2_MODIFIER_HI_EXT 0x3448
+#define EGL_DMA_BUF_PLANE3_FD_EXT          0x3440
+#define EGL_DMA_BUF_PLANE3_OFFSET_EXT      0x3441
+#define EGL_DMA_BUF_PLANE3_PITCH_EXT       0x3442
+#define EGL_DMA_BUF_PLANE3_MODIFIER_LO_EXT 0x3449
+#define EGL_DMA_BUF_PLANE3_MODIFIER_HI_EXT 0x344A
+#endif /* EGL_EXT_image_dma_buf_import_modifiers */
+
 #ifndef EGL_EXT_multiview_window
 #define EGL_EXT_multiview_window 1
 #define EGL_MULTIVIEW_VIEW_COUNT_EXT      0x3134