Revert of Remove IdleNotification call in the main thread of foreground tab.

Source/bindings/core/v8/V8Initializer.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 312 matching lines @@
 
 static bool codeGenerationCheckCallbackInMainThread(v8::Local<v8::Context> context)
 {
     if (ExecutionContext* executionContext = toExecutionContext(context)) {
         if (ContentSecurityPolicy* policy = toDocument(executionContext)->contentSecurityPolicy())
             return policy->allowEval(ScriptState::from(context), ContentSecurityPolicy::SendReport, ContentSecurityPolicy::WillThrowException);
     }
     return false;
 }
 
+static void idleGCTaskInMainThread(double deadlineSeconds)
+{
+    ASSERT(isMainThread());
+    ASSERT(RuntimeEnabledFeatures::v8IdleTasksEnabled());
+    bool gcFinished = false;
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+
+    Platform* platform = Platform::current();
+    if (deadlineSeconds > platform->monotonicallyIncreasingTime())
+        gcFinished = isolate->IdleNotificationDeadline(deadlineSeconds);
+
+    if (gcFinished)
+        platform->currentThread()->scheduler()->postIdleTaskAfterWakeup(FROM_HERE, WTF::bind<double>(idleGCTaskInMainThread));
+    else
+        platform->currentThread()->scheduler()->postIdleTask(FROM_HERE, WTF::bind<double>(idleGCTaskInMainThread));
+}
+
 static void timerTraceProfilerInMainThread(const char* name, int status)
 {
     if (!status) {
         TRACE_EVENT_BEGIN0("v8", name);
     } else {
         TRACE_EVENT_END0("v8", name);
     }
 }
 
 static void initializeV8Common(v8::Isolate* isolate)
@@ skipping 48 matching lines @@
     initializeV8Common(isolate);
 
     v8::V8::SetFatalErrorHandler(reportFatalErrorInMainThread);
     v8::V8::AddMessageListener(messageHandlerInMainThread);
     v8::V8::SetFailedAccessCheckCallbackFunction(failedAccessCheckCallbackInMainThread);
     v8::V8::SetAllowCodeGenerationFromStringsCallback(codeGenerationCheckCallbackInMainThread);
 
     if (RuntimeEnabledFeatures::v8IdleTasksEnabled()) {
         WebScheduler* scheduler = Platform::current()->currentThread()->scheduler();
         V8PerIsolateData::enableIdleTasks(isolate, adoptPtr(new V8IdleTaskRunner(scheduler)));
+        // FIXME: Remove idleGCTaskInMainThread once V8 starts posting idle task explicity.
+        scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(idleGCTaskInMainThread));
     }
 
     isolate->SetEventLogger(timerTraceProfilerInMainThread);
     isolate->SetPromiseRejectCallback(promiseRejectHandlerInMainThread);
 
     if (v8::HeapProfiler* profiler = isolate->GetHeapProfiler())
         profiler->SetWrapperClassInfoProvider(WrapperTypeInfo::NodeClassId, &RetainedDOMInfo::retainedDOMInfo);
 }
 
 static void reportFatalErrorInWorker(const char* location, const char* message)
@@ skipping 51 matching lines @@
 
     v8::V8::AddMessageListener(messageHandlerInWorker);
     v8::V8::SetFatalErrorHandler(reportFatalErrorInWorker);
 
     uint32_t here;
     isolate->SetStackLimit(reinterpret_cast<uintptr_t>(&here - kWorkerMaxStackSize / sizeof(uint32_t*)));
     isolate->SetPromiseRejectCallback(promiseRejectHandlerInWorker);
 }
 
 } // namespace blink