Add thread affinity and ASSERT() for same-thread restriction to WTF::Function

third_party/WebKit/public/platform/WebTaskRunner.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebTaskRunner_h
 #define WebTaskRunner_h
 
 #include "WebCommon.h"
 
 #ifdef INSIDE_BLINK
@@ skipping 39 matching lines @@
     virtual double virtualTimeSeconds() const = 0;
 
     // Returns a microsecond resolution platform dependant time source.
     // This may represent either the real time, or a virtual time depending on
     // whether or not the WebTaskRunner is associated with a virtual time domain or a
     // real time domain.
     virtual double monotonicallyIncreasingVirtualTimeSeconds() const = 0;
 
 #ifdef INSIDE_BLINK
     // Helpers for posting bound functions as tasks.
-    typedef Function<void()> ClosureTask;
 
-    void postTask(const WebTraceLocation&, PassOwnPtr<ClosureTask>);
-    // TODO(alexclarke): Remove this when possible.
-    void postDelayedTask(const WebTraceLocation&, PassOwnPtr<ClosureTask>, long long delayMs);
-    void postDelayedTask(const WebTraceLocation&, PassOwnPtr<ClosureTask>, double delayMs);
+    // For cross-thread posting. Can be called from any thread.
+    void postTask(const WebTraceLocation&, PassOwnPtr<CrossThreadClosure>);
+    void postDelayedTask(const WebTraceLocation&, PassOwnPtr<CrossThreadClosure>, long long delayMs);
+
+    // For same-thread posting. Must be called from the associated WebThread.
+    void postTask(const WebTraceLocation&, PassOwnPtr<SameThreadClosure>);
+    void postDelayedTask(const WebTraceLocation&, PassOwnPtr<SameThreadClosure>, long long delayMs);
 
     PassOwnPtr<WebTaskRunner> adoptClone()
     {
         return adoptPtr(clone());
     }
 #endif
 };
 
 } // namespace blink
 
 #endif // WebTaskRunner_h