Enable V8 idle tasks.

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 32 matching lines @@
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/ConsoleTypes.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/ScriptArguments.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "platform/EventDispatchForbiddenScope.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
+#include "platform/scheduler/Scheduler.h"
 #include "public/platform/Platform.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 #include <v8-debug.h>
 
 namespace blink {
 
 static LocalFrame* findFrame(v8::Local<v8::Object> host, v8::Local<v8::Value> data, v8::Isolate* isolate)
 {
     const WrapperTypeInfo* type = WrapperTypeInfo::unwrap(data);
@@ skipping 182 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));
     }
     return false;
 }
 
+static void idleGCTaskInMainThread(double deadlineSeconds);
+
+static void postIdleGCTaskMainThread()
+{
+    if (RuntimeEnabledFeatures::v8IdleTasksEnabled()) {
+        Scheduler* scheduler = Scheduler::shared();
+        if (scheduler)
+            scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(idleGCTaskInMainThread));
+    }
+}
+
+static void idleGCTaskInMainThread(double deadlineSeconds)
+{
+    ASSERT(isMainThread());
+    ASSERT(RuntimeEnabledFeatures::v8IdleTasksEnabled());
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    // FIXME: Change V8's API to take a deadline - http://crbug.com/417668
+    double idleTimeInSeconds = deadlineSeconds - Platform::current()->monotonicallyIncreasingTime();
+    int idleTimeInMillis = static_cast<int>(idleTimeInSeconds * 1000);
+    if (idleTimeInMillis > 0)
+        isolate->IdleNotification(idleTimeInMillis);
+    // FIXME: only repost if there is more work to do.
+    postIdleGCTaskMainThread();
+}
+
 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 19 matching lines @@
 
     v8::Isolate* isolate = V8PerIsolateData::initialize();
 
     initializeV8Common(isolate);
 
     v8::V8::SetFatalErrorHandler(reportFatalErrorInMainThread);
     v8::V8::AddMessageListener(messageHandlerInMainThread);
     v8::V8::SetFailedAccessCheckCallbackFunction(failedAccessCheckCallbackInMainThread);
     v8::V8::SetAllowCodeGenerationFromStringsCallback(codeGenerationCheckCallbackInMainThread);
 
+    postIdleGCTaskMainThread();
+
     isolate->SetEventLogger(timerTraceProfilerInMainThread);
     isolate->SetPromiseRejectCallback(promiseRejectHandlerInMainThread);
 
     ScriptProfiler::initialize();
 }
 
 static void reportFatalErrorInWorker(const char* location, const char* message)
 {
     // FIXME: We temporarily deal with V8 internal error situations such as out-of-memory by crashing the worker.
     CRASH();
@@ skipping 37 matching lines @@
     initializeV8Common(isolate);
 
     v8::V8::AddMessageListener(messageHandlerInWorker);
     v8::V8::SetFatalErrorHandler(reportFatalErrorInWorker);
 
     uint32_t here;
     isolate->SetStackLimit(reinterpret_cast<uintptr_t>(&here - kWorkerMaxStackSize / sizeof(uint32_t*)));
 }
 
 } // namespace blink