Add logging to DFM request/update status

Bug: b/133669491

Change-Id: I61a9767a08a0024155a40ca4e88e5022209644a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638193Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Fred Mello <fredmello@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665204}

components/module_installer/android/java/src-impl/org/chromium/components/module_installer/PlayCoreModuleInstallerBackend.java

@@ -174,6 +174,7 @@ import java.util.Set;
     @Override
     public void onStateUpdate(SplitInstallSessionState state) {
         assert !mIsClosed;
+        Log.i(TAG, "Status for modules '%s' updated to %d", state.moduleNames(), state.status());
         switch (state.status()) {
             case SplitInstallSessionStatus.DOWNLOADING:
             case SplitInstallSessionStatus.DOWNLOADED: