Revert of Implement timers by posting delayed tasks

Source/platform/SharedTimer.h

Index: Source/platform/SharedTimer.h
diff --git a/Source/platform/SharedTimer.h b/Source/platform/SharedTimer.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9567f0bbcb20451fdbc80dd55b1dd613a60d98e
--- /dev/null
+++ b/Source/platform/SharedTimer.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SharedTimer_h
+#define SharedTimer_h
+
+#include "platform/PlatformExport.h"
+#include "wtf/FastAllocBase.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+// Each thread has its own single instance of shared timer, which implements this interface.
+// This instance is shared by all timers in the thread.
+// Not intended to be used directly; use the Timer class instead.
+class PLATFORM_EXPORT SharedTimer {
+    WTF_MAKE_NONCOPYABLE(SharedTimer); WTF_MAKE_FAST_ALLOCATED(SharedTimer);
+public:
+    SharedTimer() { }
+    virtual ~SharedTimer() {}
+    virtual void setFiredFunction(void (*)()) = 0;
+
+    // The fire interval is in seconds relative to the current monotonic clock time.
+    virtual void setFireInterval(double) = 0;
+    virtual void stop() = 0;
+};
+
+
+PLATFORM_EXPORT void setSharedTimerFiredFunction(void (*)());
+PLATFORM_EXPORT void setSharedTimerFireInterval(double);
+PLATFORM_EXPORT void stopSharedTimer();
+
+class PLATFORM_EXPORT MainThreadSharedTimer : public SharedTimer {
+public:
+    virtual void setFiredFunction(void (*function)()) override
+    {
+        setSharedTimerFiredFunction(function);
+    }
+
+    virtual void setFireInterval(double interval) override
+    {
+        setSharedTimerFireInterval(interval);
+    }
+
+    virtual void stop() override
+    {
+        stopSharedTimer();
+    }
+};
+
+} // namespace blink
+
+#endif // SharedTimer_h