[CRD iOS] Some fixes for rendering

remoting/client/jni/jni_gl_display_handler.cc

Index: remoting/client/jni/jni_gl_display_handler.cc
diff --git a/remoting/client/jni/jni_gl_display_handler.cc b/remoting/client/jni/jni_gl_display_handler.cc
index 3b511399e4b354c0230d912cb89a46428e725fed..5d5d72bd75320f67bf87691d92a82eaec9de5d2a 100644
--- a/remoting/client/jni/jni_gl_display_handler.cc
+++ b/remoting/client/jni/jni_gl_display_handler.cc
@@ -159,6 +159,10 @@ void JniGlDisplayHandler::Core::SurfaceCreated(
 
 void JniGlDisplayHandler::Core::SurfaceChanged(int width, int height) {
   DCHECK(runtime_->display_task_runner()->BelongsToCurrentThread());
+  // Note that this doesn't resize the OpenGL viewport. The OpenGL viewport is
+  // initialized once it is first bound to the surface. We don't need to call
+  // glViewport() since the activity/surface is recreated and hence the viewport
+  // is re-initialized every time the surface size is changed.
   renderer_->OnSurfaceChanged(width, height);
 }