Add methods needed by Transformer to GlUtil

This is to add a step to the Transformer transcoding video pipeline to
copy from a surface to another using OpenGL.

PiperOrigin-RevId: 393391005

RELEASENOTES.md

@@ -11,6 +11,8 @@
     *   Deprecate `SimpleExoPlayer.Builder`. Use `ExoPlayer.Builder` instead.
     *   Fix track selection in `StyledPlayerControlView` when using
         `ForwardingPlayer`.
+    *   Remove `ExoPlayerLibraryInfo.GL_ASSERTIONS_ENABLED`. Use
+        `GlUtil.glAssertionsEnabled` instead.
 *   Extractors:
     *   Support TS packets without PTS flag
         ([#9294](https://github.com/google/ExoPlayer/issues/9294)).

library/common/src/main/java/com/google/android/exoplayer2/ExoPlayerLibraryInfo.java

@@ -57,9 +57,6 @@ public final class ExoPlayerLibraryInfo {
    */
   public static final boolean ASSERTIONS_ENABLED = true;
 
-  /** Whether an exception should be thrown in case of an OpenGl error. */
-  public static final boolean GL_ASSERTIONS_ENABLED = false;
-
   /**
    * Whether the library was compiled with {@link com.google.android.exoplayer2.util.TraceUtil}
    * trace enabled.