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diff --git a/dom/media/gmp/gmp-api/gmp-platform.h b/dom/media/gmp/gmp-api/gmp-platform.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** 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.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * HOLDER 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 GMP_PLATFORM_h_
+#define GMP_PLATFORM_h_
+
+#include "gmp-errors.h"
+#include "gmp-storage.h"
+#include <stdint.h>
+
+/* Platform helper API. */
+
+class GMPTask {
+ public:
+  virtual void Destroy() = 0;  // Deletes object.
+  virtual ~GMPTask() = default;
+  virtual void Run() = 0;
+};
+
+class GMPThread {
+ public:
+  virtual ~GMPThread() = default;
+  virtual void Post(GMPTask* aTask) = 0;
+  virtual void Join() = 0;  // Deletes object after join completes.
+};
+
+// A re-entrant monitor; can be locked from the same thread multiple times.
+// Must be unlocked the same number of times it's locked.
+class GMPMutex {
+ public:
+  virtual ~GMPMutex() = default;
+  virtual void Acquire() = 0;
+  virtual void Release() = 0;
+  virtual void Destroy() = 0;  // Deletes object.
+};
+
+// Time is defined as the number of milliseconds since the
+// Epoch (00:00:00 UTC, January 1, 1970).
+typedef int64_t GMPTimestamp;
+
+typedef GMPErr (*GMPCreateThreadPtr)(GMPThread** aThread);
+typedef GMPErr (*GMPRunOnMainThreadPtr)(GMPTask* aTask);
+typedef GMPErr (*GMPSyncRunOnMainThreadPtr)(GMPTask* aTask);
+typedef GMPErr (*GMPCreateMutexPtr)(GMPMutex** aMutex);
+
+// Call on main thread only.
+typedef GMPErr (*GMPCreateRecordPtr)(const char* aRecordName,
+                                     uint32_t aRecordNameSize,
+                                     GMPRecord** aOutRecord,
+                                     GMPRecordClient* aClient);
+
+// Call on main thread only.
+typedef GMPErr (*GMPSetTimerOnMainThreadPtr)(GMPTask* aTask,
+                                             int64_t aTimeoutMS);
+typedef GMPErr (*GMPGetCurrentTimePtr)(GMPTimestamp* aOutTime);
+
+struct GMPPlatformAPI {
+  // Increment the version when things change. Can only add to the struct,
+  // do not change what already exists. Pointers to functions may be NULL
+  // when passed to plugins, but beware backwards compat implications of
+  // doing that.
+  uint16_t version;  // Currently version 0
+
+  GMPCreateThreadPtr createthread;
+  GMPRunOnMainThreadPtr runonmainthread;
+  GMPSyncRunOnMainThreadPtr syncrunonmainthread;
+  GMPCreateMutexPtr createmutex;
+  GMPCreateRecordPtr createrecord;
+  GMPSetTimerOnMainThreadPtr settimer;
+  GMPGetCurrentTimePtr getcurrenttime;
+};
+
+#endif  // GMP_PLATFORM_h_