Enable the CORS preflight for sendBeacon()

third_party/WebKit/Source/core/loader/ThreadableLoader.h

Index: third_party/WebKit/Source/core/loader/ThreadableLoader.h
diff --git a/third_party/WebKit/Source/core/loader/ThreadableLoader.h b/third_party/WebKit/Source/core/loader/ThreadableLoader.h
index 9e8c56c6bc826de43fc680b5f4828c4eb83a1c60..36ec341f19c2aa776c5316bce9f7778944519975 100644
--- a/third_party/WebKit/Source/core/loader/ThreadableLoader.h
+++ b/third_party/WebKit/Source/core/loader/ThreadableLoader.h
@@ -58,13 +58,19 @@ enum ContentSecurityPolicyEnforcement {
   DoNotEnforceContentSecurityPolicy,
 };
 
+enum SchedulerWaitingPolicy {
+  PreventSchedulerFromWaiting,
+  DoNotPreventSchedulerFromWaiting,
+};
+
 struct ThreadableLoaderOptions {
   DISALLOW_NEW();
   ThreadableLoaderOptions()
       : preflightPolicy(ConsiderPreflight),
         crossOriginRequestPolicy(DenyCrossOriginRequests),
         contentSecurityPolicyEnforcement(EnforceContentSecurityPolicy),
-        timeoutMilliseconds(0) {}
+        timeoutMilliseconds(0),
+        schedulerWaitingPolicy(DoNotPreventSchedulerFromWaiting) {}
 
   // When adding members, CrossThreadThreadableLoaderOptionsData should
   // be updated.
@@ -76,6 +82,7 @@ struct ThreadableLoaderOptions {
   AtomicString initiator;
   ContentSecurityPolicyEnforcement contentSecurityPolicyEnforcement;
   unsigned long timeoutMilliseconds;
+  SchedulerWaitingPolicy schedulerWaitingPolicy;
 };
 
 // Encode AtomicString as String to cross threads.
@@ -88,7 +95,8 @@ struct CrossThreadThreadableLoaderOptionsData {
         initiator(options.initiator.getString().isolatedCopy()),
         contentSecurityPolicyEnforcement(
             options.contentSecurityPolicyEnforcement),
-        timeoutMilliseconds(options.timeoutMilliseconds) {}
+        timeoutMilliseconds(options.timeoutMilliseconds),
+        schedulerWaitingPolicy(options.schedulerWaitingPolicy) {}
 
   operator ThreadableLoaderOptions() const {
     ThreadableLoaderOptions options;
@@ -97,6 +105,7 @@ struct CrossThreadThreadableLoaderOptionsData {
     options.initiator = AtomicString(initiator);
     options.contentSecurityPolicyEnforcement = contentSecurityPolicyEnforcement;
     options.timeoutMilliseconds = timeoutMilliseconds;
+    options.schedulerWaitingPolicy = schedulerWaitingPolicy;
     return options;
   }
 
@@ -105,6 +114,7 @@ struct CrossThreadThreadableLoaderOptionsData {
   String initiator;
   ContentSecurityPolicyEnforcement contentSecurityPolicyEnforcement;
   unsigned long timeoutMilliseconds;
+  SchedulerWaitingPolicy schedulerWaitingPolicy;
 };
 
 template <>