Split atomic and mutex implementations and make inlinable.

src/ports/SkMutex_win.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMutex_win_DEFINED
+#define SkMutex_win_DEFINED
+
+/** Windows CriticalSection based mutex. */
+
+#include "SkTypes.h"
+
+// On Windows, SkBaseMutex and SkMutex are the same thing,
+// we can't easily get rid of static initializers.
+class SkMutex : SkNoncopyable {
+public:
+    SkMutex() {
+        InitializeCriticalSection(&fStorage);
+    }
+
+    ~SkMutex() {
+        DeleteCriticalSection(&fStorage);
+    }
+
+    void acquire() {
+        EnterCriticalSection(&fStorage);
+    }
+
+    void release() {
+        LeaveCriticalSection(&fStorage);
+    }
+
+private:
+    CRITICAL_SECTION fStorage;
+};
+
+typedef SkMutex SkBaseMutex;
+
+// Windows currently provides no documented means of POD initializing a CRITICAL_SECTION.
+#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name
+#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name
+
+#endif