Revert "Implement timers by posting delayed tasks"

Source/platform/SharedTimer.h

Index: Source/platform/SharedTimer.h
diff --git a/Source/modules/webdatabase/sqlite/SQLiteTransaction.h b/Source/platform/SharedTimer.h
similarity index 54%
copy from Source/modules/webdatabase/sqlite/SQLiteTransaction.h
copy to Source/platform/SharedTimer.h
index d0034b8d43ea52c4fbcda4eaa88ec217b8696b0e..b9567f0bbcb20451fdbc80dd55b1dd613a60d98e 100644
--- a/Source/modules/webdatabase/sqlite/SQLiteTransaction.h
+++ b/Source/platform/SharedTimer.h
@@ -23,35 +23,53 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef SQLiteTransaction_h
-#define SQLiteTransaction_h
+#ifndef SharedTimer_h
+#define SharedTimer_h
 
+#include "platform/PlatformExport.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
-class SQLiteDatabase;
+// 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;
+};
+
 
-class SQLiteTransaction {
-    WTF_MAKE_NONCOPYABLE(SQLiteTransaction); WTF_MAKE_FAST_ALLOCATED(SQLiteTransaction);
+PLATFORM_EXPORT void setSharedTimerFiredFunction(void (*)());
+PLATFORM_EXPORT void setSharedTimerFireInterval(double);
+PLATFORM_EXPORT void stopSharedTimer();
+
+class PLATFORM_EXPORT MainThreadSharedTimer : public SharedTimer {
 public:
-    SQLiteTransaction(SQLiteDatabase& db, bool readOnly = false);
-    ~SQLiteTransaction();
-
-    void begin();
-    void commit();
-    void rollback();
-    void stop();
-
-    bool inProgress() const { return m_inProgress; }
-    bool wasRolledBackBySqlite() const;
-private:
-    SQLiteDatabase& m_db;
-    bool m_inProgress;
-    bool m_readOnly;
+    virtual void setFiredFunction(void (*function)()) override
+    {
+        setSharedTimerFiredFunction(function);
+    }
+
+    virtual void setFireInterval(double interval) override
+    {
+        setSharedTimerFireInterval(interval);
+    }
+
+    virtual void stop() override
+    {
+        stopSharedTimer();
+    }
 };
 
 } // namespace blink
 
-#endif // SQLiteTransation_H
+#endif // SharedTimer_h