Implement our own GLThread for VR Shell.

ui/gl/android/surface_texture.cc

Index: ui/gl/android/surface_texture.cc
diff --git a/ui/gl/android/surface_texture.cc b/ui/gl/android/surface_texture.cc
index 69c9004defa2a8138084fb22417aa39059810589..309e55b765fbcc1336dac50f7309bf3787430d38 100644
--- a/ui/gl/android/surface_texture.cc
+++ b/ui/gl/android/surface_texture.cc
@@ -100,4 +100,10 @@ void SurfaceTexture::ReleaseSurfaceTexture() {
   Java_SurfaceTexturePlatformWrapper_release(env, j_surface_texture_);
 }
 
+void SurfaceTexture::SetDefaultBufferSize(int width, int height) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_SurfaceTexturePlatformWrapper_setDefaultBufferSize(
+      env, j_surface_texture_, width, height);
+}
+
 }  // namespace gl