opengl: Un-hide GLES31 and GLES31Ext classes

Bug: 15028495
Change-Id: Iaac1e8d2ad5ea840d728a78804e2566be18a4340
diff --git a/opengl/tools/glgen/stubs/gles11/GLES31ExtHeader.java-if b/opengl/tools/glgen/stubs/gles11/GLES31ExtHeader.java-if
index 546306c..8fc2f1c 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES31ExtHeader.java-if
+++ b/opengl/tools/glgen/stubs/gles11/GLES31ExtHeader.java-if
@@ -18,7 +18,6 @@
 
 package android.opengl;
 
-/** @hide */
 public class GLES31Ext {
 
     // GL_KHR_blend_equation_advanced
diff --git a/opengl/tools/glgen/stubs/gles11/GLES31Header.java-if b/opengl/tools/glgen/stubs/gles11/GLES31Header.java-if
index a1fc02c..5b45df4 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES31Header.java-if
+++ b/opengl/tools/glgen/stubs/gles11/GLES31Header.java-if
@@ -19,7 +19,6 @@
 package android.opengl;
 
 /** OpenGL ES 3.1
- * @hide
  */
 public class GLES31 extends GLES30 {