systrace: support legacy systrace format
In some old systrace html file it doesn't include the key words for "" to indicate trace beginning and '<script class="trace-data"' for trace raw data beginning.
So this patch tries to find compatible string for old and new systrace format. It changes to use "
Android System Trace" and " var linuxPerfData" to indicate trace start and trace data start.Signed-off-by: Leo Yan leo.yan@linaro.org