Work on getting things built with -Wimplicit-fallthrough. This CL was uploaded by git cl split.

Bug: 177475
R=rogerm@chromium.org

Change-Id: I4c5c56af1d9ed85a4df6ec9651a189d232180036
Reviewed-on: https://chromium-review.googlesource.com/889761Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532991}

components/assist_ranker/ranker_model_loader_impl.cc

@@ -121,6 +121,7 @@ void RankerModelLoaderImpl::NotifyOfRankerActivity() {
       // There was no configured model path. Switch the state to IDLE and
       // fall through to consider the URL.
       state_ = LoaderState::IDLE;
+      FALLTHROUGH;
     case LoaderState::IDLE:
       if (model_url_.is_valid()) {
         StartLoadFromURL();
@@ -129,6 +130,7 @@ void RankerModelLoaderImpl::NotifyOfRankerActivity() {
       // There was no configured model URL. Switch the state to FINISHED and
       // fall through.
       state_ = LoaderState::FINISHED;
+      FALLTHROUGH;
     case LoaderState::FINISHED:
     case LoaderState::LOADING_FROM_FILE:
     case LoaderState::LOADING_FROM_URL: