Use v8::MicrotasksScope internally in V8RecursionScope.

chrome/test/base/v8_unit_test.cc

Index: chrome/test/base/v8_unit_test.cc
diff --git a/chrome/test/base/v8_unit_test.cc b/chrome/test/base/v8_unit_test.cc
index 9f52f061d65079b36c771527a6955027ea5fc762..392ff45bf5a454a781c2c9fa5a3588dc4a30672e 100644
--- a/chrome/test/base/v8_unit_test.cc
+++ b/chrome/test/base/v8_unit_test.cc
@@ -11,6 +11,7 @@
 #include "base/strings/stringprintf.h"
 #include "chrome/common/chrome_paths.h"
 #include "third_party/WebKit/public/web/WebKit.h"
+#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
 
 namespace {
 
@@ -95,6 +96,7 @@ bool V8UnitTest::RunJavascriptTestF(const std::string& test_fixture,
   v8::Local<v8::Context> context =
       v8::Local<v8::Context>::New(isolate, context_);
   v8::Context::Scope context_scope(context);
+  blink::WebScopedMicrotaskSuppression microtasks_scope;
 
   v8::Local<v8::Value> function_property =
       context->Global()->Get(v8::String::NewFromUtf8(isolate, "runTest"));
@@ -209,6 +211,7 @@ void V8UnitTest::ExecuteScriptInContext(const base::StringPiece& script_source,
   v8::Local<v8::Context> context =
       v8::Local<v8::Context>::New(isolate, context_);
   v8::Context::Scope context_scope(context);
+  blink::WebScopedMicrotaskSuppression microtasks_scope;
   v8::Local<v8::String> source =
       v8::String::NewFromUtf8(isolate,
                               script_source.data(),
@@ -257,6 +260,7 @@ void V8UnitTest::TestFunction(const std::string& function_name) {
   v8::Local<v8::Context> context =
       v8::Local<v8::Context>::New(isolate, context_);
   v8::Context::Scope context_scope(context);
+  blink::WebScopedMicrotaskSuppression microtasks_scope;
 
   v8::Local<v8::Value> function_property = context->Global()->Get(
       v8::String::NewFromUtf8(isolate, function_name.c_str()));