Use official EGL.h.

We upstreamed the changes here so it is no longer necessary to maintain
a fork.

Bug: angleproject:3706
Change-Id: I21cc63cb94f8b3603d75ce8ec86b856514a8cb5d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1749335
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

include/EGL/README.md

@@ -1,28 +0,0 @@
-#  ANGLE EGL Headers
-
-The EGL headers ANGLE uses are generated using the Khronos tools but modified to include function pointer types and function prototype guards.
-
-### Regenerating EGL.h
-
-1. Install **Python 3** (not 2) with the **lxml** addon. You can do this using `pip install lxml` from your Python's Scripts folder.
-1. Clone [https://github.com/KhronosGroup/EGL-Registry.git](https://github.com/KhronosGroup/EGL-Registry.git).
-1. Edit `EGL-Registry/api/genheaders.py` and add the following under `glesProtoPrefixStrings`:
-```# EGL headers use a protection mechanism similar to GLES.
-eglProtoPrefixStrings = [
-    '#ifndef EGL_EGL_PROTOTYPES',
-    '#define EGL_EGL_PROTOTYPES 1',
-    '#endif',
-    ''
-]
-```
-4. Also in `EGL-Registry/api/genheaders.py`:
-   1. Look for the section titled `# EGL API - EGL/egl.h (no function pointers, yet @@@)`
-   1. Set `prefixText` to `prefixStrings + eglPlatformStrings + eglProtoPrefixStrings + genDateCommentString`
-   1. Change `genFuncPointers   = False,` to `genFuncPointers   = True,`
-   1. Change `protectProto      = False,` to `protectProto      = 'nonzero',`
-   1. Change `protectProtoStr   = 'EGL_EGLEXT_PROTOTYPES',` to `protectProtoStr   = 'EGL_EGL_PROTOTYPES',`
-
-1. Set your working directory to `EGL-Registry/api/`.
-1. Run `python genheaders.py -registry egl.xml EGL/egl.h`
-1. The generated header will now be in `EGL-Registry/api/EGL/egl.h`. You can copy the header over to this folder.
-1. Also update `scripts/egl.xml` with the latest version from `EGL-Registry/api/`.

include/EGL/egl.h

@@ -33,7 +33,7 @@ extern "C" {
 ** used to make the header, and the header can be found at
 **   http://www.khronos.org/registry/egl
 **
-** Khronos $Git commit SHA1: d738c39fe2 $ on $Git commit date: 2019-06-14 16:17:31 -0600 $
+** Khronos $Git commit SHA1: cb927ca98d $ on $Git commit date: 2019-08-08 01:05:38 -0700 $
 */
 
 #include <EGL/eglplatform.h>
@@ -42,7 +42,7 @@ extern "C" {
 #define EGL_EGL_PROTOTYPES 1
 #endif
 
-/* Generated on date 20190716 */
+/* Generated on date 20190808 */
 
 /* Generated C header for:
  * API: egl