[wakelock] Add temporary logging for debugging

This change adds temporary info-level log messages around code called
when a wake lock is released to debug an Android-specific failure which
is not reproducible on a local build.

Bug: 1064550
No-Presubmit: true
Change-Id: I7bb461c0407857c93792511c0f0a2d33e9000bb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147926
Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Reviewed-by: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758750}

services/device/wake_lock/wake_lock.cc

@@ -36,7 +36,9 @@ WakeLock::WakeLock(mojo::PendingReceiver<mojom::WakeLock> receiver,
       &WakeLock::OnConnectionError, base::Unretained(this)));
 }
 
-WakeLock::~WakeLock() {}
+WakeLock::~WakeLock() {
+  LOG(INFO) << "Destroying WakeLock (browser side).";
+}
 
 void WakeLock::AddClient(mojo::PendingReceiver<mojom::WakeLock> receiver) {
   DCHECK(main_task_runner_->RunsTasksInCurrentSequence());

third_party/blink/renderer/modules/wake_lock/wake_lock_manager.cc

@@ -95,6 +95,7 @@ void WakeLockManager::ClearWakeLocks() {
 }
 
 void WakeLockManager::OnWakeLockConnectionError() {
+  LOG(INFO) << "Clearing wake locks on connection error.";
   wake_lock_.reset();
   ClearWakeLocks();
 }

third_party/blink/renderer/modules/wake_lock/wake_lock_sentinel.cc

@@ -90,6 +90,7 @@ void WakeLockSentinel::DoRelease() {
   if (!GetExecutionContext() || GetExecutionContext()->IsContextDestroyed())
     return;
 
+  LOG(INFO) << "Dispatching release event.";
   // 6. Queue a task to fire an event named "release" at lock.
   DispatchEvent(*Event::Create(event_type_names::kRelease));
 }