[DONT COMMIT] Worker: Add checks in InProcessWorkerObjectProxy for debug

third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp

Index: third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp
diff --git a/third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp b/third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp
index fffaf55c94f4f9a1c7765a948ad30b20d51e8490..8e39e397d6aab263046adc1bbe5039e85b368e33 100644
--- a/third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp
+++ b/third_party/WebKit/Source/core/workers/InProcessWorkerObjectProxy.cpp
@@ -129,6 +129,7 @@ void InProcessWorkerObjectProxy::DidCreateWorkerGlobalScope(
   timer_ = WTF::MakeUnique<TaskRunnerTimer<InProcessWorkerObjectProxy>>(
       TaskRunnerHelper::Get(TaskType::kUnthrottled, global_scope), this,
       &InProcessWorkerObjectProxy::CheckPendingActivity);
+  was_initialized_ = true;
 }
 
 void InProcessWorkerObjectProxy::DidEvaluateWorkerScript(bool) {
@@ -138,6 +139,7 @@ void InProcessWorkerObjectProxy::DidEvaluateWorkerScript(bool) {
 void InProcessWorkerObjectProxy::WillDestroyWorkerGlobalScope() {
   timer_.reset();
   worker_global_scope_ = nullptr;
+  was_destroyed_ = true;
 }
 
 InProcessWorkerObjectProxy::InProcessWorkerObjectProxy(
@@ -150,6 +152,10 @@ InProcessWorkerObjectProxy::InProcessWorkerObjectProxy(
       max_interval_in_sec_(kMaxIntervalInSec) {}
 
 void InProcessWorkerObjectProxy::StartPendingActivityTimer() {
+  // TODO(nhiroki): Remove these checks after https://crbug.com/713914 is fixed.
+  CHECK(was_initialized_);
+  CHECK(!was_destroyed_);
+  CHECK(timer_);
   if (timer_->IsActive()) {
     // Reset the next interval duration to check new activity state timely.
     // For example, a long-running activity can be cancelled by a message