Allow enabling ANGLE for GAME_MODE_STANDARD

For b/210469739, we need to be able to enable ANGLE by default for
games specified in the Game Dashboard phenotype. To do this, the
device config will be updated to include: mode=1,useAngle=true for the
necessary packages. This indicates to the GameManager that ANGLE is
enabled for GameManager.GAME_MODE_STANDARD.

Tested with:
    adb shell device_config put game_overlay $PACKAGE_NAME mode=1,useAngle=true

Bug: b/210686699
Test: atest CtsAngleIntegrationHostTestCases
Change-Id: Ib723005a01109a74e597b5c06dd9f1a692967184

services/core/java/com/android/server/app/GameManagerService.java

@@ -385,7 +385,8 @@ public final class GameManagerService extends IGameManagerService.Stub {
             }
 
             public boolean isValid() {
-                return mGameMode == GameManager.GAME_MODE_PERFORMANCE
+                return mGameMode == GameManager.GAME_MODE_STANDARD
+                        || mGameMode == GameManager.GAME_MODE_PERFORMANCE
                         || mGameMode == GameManager.GAME_MODE_BATTERY;
             }
 

services/core/java/com/android/server/app/GameManagerShellCommand.java

@@ -167,15 +167,9 @@ public class GameManagerShellCommand extends ShellCommand {
         switch (gameMode.toLowerCase()) {
             case "1":
             case "standard":
-                // Standard should only be available if other game modes are.
-                if (batteryModeSupported || perfModeSupported) {
-                    service.setGameMode(packageName, GameManager.GAME_MODE_STANDARD,
-                            userId);
-                } else {
-                    pw.println("Game mode: " + gameMode + " not supported by "
-                            + packageName);
-                    return -1;
-                }
+                // Standard mode can be used to specify loading ANGLE as the default OpenGL ES
+                // driver, so it should always be available.
+                service.setGameMode(packageName, GameManager.GAME_MODE_STANDARD, userId);
                 break;
             case "2":
             case "performance":