[AndroidSms] Add logging for pairing state tracking.

This CL adds additional logging to help understand what is triggering
pairing state change in https://crbug.com/1060823

Bug: 1060823
Change-Id: I774167ae0e420bae11c0c58a9caf8937f0c93961
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138562
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756915}

chrome/browser/chromeos/android_sms/android_sms_pairing_state_tracker_impl.cc

@@ -69,6 +69,7 @@ void AndroidSmsPairingStateTrackerImpl::OnCookiesRetrieved(
     }
   }
 
+  PA_LOG(INFO) << "No Pairing cookie found";
   was_paired_on_last_update_ = false;
   if (was_previously_paired != was_paired_on_last_update_)
     NotifyPairingStateChanged();
@@ -88,6 +89,8 @@ void AndroidSmsPairingStateTrackerImpl::OnCookieChange(
 void AndroidSmsPairingStateTrackerImpl::OnInstalledAppUrlChanged() {
   // If the app URL changed, stop any ongoing cookie monitoring and attempt to
   // add a new change listener.
+  PA_LOG(INFO) << "Installed app url changed to " << GetPairingUrl()
+               << ". Updating cookie listeners.";
   cookie_listener_receiver_.reset();
   AddCookieChangeListener();
 }

chromeos/services/multidevice_setup/android_sms_app_installing_status_observer.cc

@@ -81,12 +81,15 @@ bool AndroidSmsAppInstallingStatusObserver::
 
 void AndroidSmsAppInstallingStatusObserver::UpdatePwaInstallationState() {
   if (!DoesFeatureStateAllowInstallation()) {
+    PA_LOG(INFO)
+        << "Feature state does not allow installation, tearing down App.";
     // The feature is disabled, ensure that the integration cookie is removed.
     android_sms_app_helper_delegate_->TearDownAndroidSmsApp();
     return;
   }
 
   if (android_sms_app_helper_delegate_->HasAppBeenManuallyUninstalledByUser()) {
+    PA_LOG(INFO) << "App was manually uninstalled by user, tearing down App.";
     feature_state_manager_->SetFeatureEnabledState(mojom::Feature::kMessages,
                                                    false);