Let the second pass phantom callbacks run in a separate task on the foreground thread.

samples/process.cc

Index: samples/process.cc
diff --git a/samples/process.cc b/samples/process.cc
index a62950a76ab4b7885771cf4f56bcd6693410f898..c18fb414283c02620913c96bf833b0b750a64a55 100644
--- a/samples/process.cc
+++ b/samples/process.cc
@@ -666,11 +666,13 @@ StringHttpRequest kSampleRequests[kSampleSize] = {
 };
 
 
-bool ProcessEntries(HttpRequestProcessor* processor, int count,
-                    StringHttpRequest* reqs) {
+bool ProcessEntries(v8::Platform* platform, HttpRequestProcessor* processor,
+                    int count, StringHttpRequest* reqs) {
   for (int i = 0; i < count; i++) {
-    if (!processor->Process(&reqs[i]))
-      return false;
+    bool result = processor->Process(&reqs[i]);
+    while (v8::platform::PumpMessageLoop(platform, Isolate::GetCurrent()))
+      continue;
+    if (!result) return false;
   }
   return true;
 }
@@ -713,7 +715,7 @@ int main(int argc, char* argv[]) {
     fprintf(stderr, "Error initializing processor.\n");
     return 1;
   }
-  if (!ProcessEntries(&processor, kSampleSize, kSampleRequests))
+  if (!ProcessEntries(platform, &processor, kSampleSize, kSampleRequests))
     return 1;
   PrintMap(&output);
 }