Add new API to toggle ANGLE as the default system GLES driver

Bug:b/270994705
Test: Flash, verify Pixel 7 can boot.
Toggle the developer option switch.
adb shell getprop persist.graphics.egl is returning
right values with switch set on and off.

Change-Id: Idce453d79e97c48cc965900315799784a001e053
diff --git a/libs/graphicsenv/GraphicsEnv.cpp b/libs/graphicsenv/GraphicsEnv.cpp
index 46dd62d..c480056 100644
--- a/libs/graphicsenv/GraphicsEnv.cpp
+++ b/libs/graphicsenv/GraphicsEnv.cpp
@@ -689,4 +689,13 @@
     return mAngleNamespace;
 }
 
+void GraphicsEnv::nativeToggleAngleAsSystemDriver(bool enabled) {
+    const sp<IGpuService> gpuService = getGpuService();
+    if (!gpuService) {
+        ALOGE("No GPU service");
+        return;
+    }
+    gpuService->toggleAngleAsSystemDriver(enabled);
+}
+
 } // namespace android