Surface Synchronization: Detect invariants violations in LayerTreeHost

Currently some invariants violation checks are in LayerTreeHost for mac
but not for other platforms. This CL enables the check on other platforms.

Bug: 672962
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iade0eee8322f9126a5ee7409b2e79aa00593b2d1
Reviewed-on: https://chromium-review.googlesource.com/1217598Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590175}

cc/trees/layer_tree_host.cc

@@ -1127,13 +1127,9 @@ void LayerTreeHost::SetViewportSizeAndScale(
   if (changed) {
     SetPropertyTreesNeedRebuild();
     SetNeedsCommit();
-#if defined(OS_MACOSX)
-    // TODO(ccameron): This check is not valid on Aura or Mus yet, but should
-    // be.
     CHECK(!has_pushed_local_surface_id_from_parent_ ||
           new_local_surface_id_request_ ||
           !local_surface_id_from_parent_.is_valid());
-#endif
   }
 }