Update from https://crrev.com/314320

third_party/khronos/README.chromium

Index: third_party/khronos/README.chromium
diff --git a/third_party/khronos/README.chromium b/third_party/khronos/README.chromium
index 10259c9fb4b7a692ea936f495aab5bf087f216c1..052e9d9a79a57135e89f6d174e277e1fc70dcc44 100644
--- a/third_party/khronos/README.chromium
+++ b/third_party/khronos/README.chromium
@@ -12,17 +12,19 @@ Khronos. They are used for compiling code against these APIs as well as for
 generating the GL binding initialization logic.
 
 MIT/X11 (BSD like) license is for {EGL,KHR}/*, SGI Free Software License B is
-for GLES2/* and GLES3/*.
+for noninclude/GL/*, GLES2/* and GLES3/*.
 
 Local Modifications:
 
 NOTE: Please add Chromium-specific declarations to files in gpu/{GL,EGL,GLES2}
 and not here.
 
+noninclude/GL/glext.h
+ - Added missing function prototypes and enums for GL_KHR_robustness
 GLES2/gl2.h
  - Added include of gl2chromium.h
 GLES2/gl2ext.h
- - Chromium-specific define to account for issues in gles2_conform_test, 
+ - Chromium-specific define to account for issues in gles2_conform_test,
    see http://crbug.com/329708.
  - Commented out GL_SAMPLER, conflicts with third_party/gles2_conform
  - Drop const from last argument of GLDEBUGPROCKHR (win trybot fail)