Reland "Implement V8Platform::CallDelayedOnForegroundThread. (patchset #2 id:20001 of https://codereview.chromium.org/1181113003/)"

This reverts commit f4f00c7a28bb5786f5dce52acf4e8bd2d39df6a2.

BUG=490559

Review URL: https://codereview.chromium.org/1204873003

Cr-Commit-Position: refs/heads/master@{#335937}
diff --git a/gin/v8_platform.cc b/gin/v8_platform.cc
index 330aeb3..6214d3d3 100644
--- a/gin/v8_platform.cc
+++ b/gin/v8_platform.cc
@@ -38,6 +38,14 @@
       FROM_HERE, base::Bind(&v8::Task::Run, base::Owned(task)));
 }
 
+void V8Platform::CallDelayedOnForegroundThread(v8::Isolate* isolate,
+                                               v8::Task* task,
+                                               double delay_in_seconds) {
+  PerIsolateData::From(isolate)->task_runner()->PostDelayedTask(
+      FROM_HERE, base::Bind(&v8::Task::Run, base::Owned(task)),
+      base::TimeDelta::FromSecondsD(delay_in_seconds));
+}
+
 double V8Platform::MonotonicallyIncreasingTime() {
   return base::TimeTicks::Now().ToInternalValue() /
       static_cast<double>(base::Time::kMicrosecondsPerSecond);