Factor out DumpRecord method from dump_record tool for later use

tools/DumpRecord.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef DumpRecord_DEFINED
+#define DumpRecord_DEFINED
+
+class SkRecord;
+class SkCanvas;
+
+/**
+ * Draw the record to the supplied canvas via SkRecords::Draw, while
+ * printing each draw command and run time in microseconds to stdout.
+ *
+ * @param timeWithCommand If true, print time next to command, else in
+ *        first column.
+ */
+void DumpRecord(const SkRecord& record,
+                SkCanvas* canvas,
+                bool timeWithCommand);
+
+#endif  // DumpRecord_DEFINED