Add timestamps to mediaextractor dumpsys

#include <utils/Log.h>

#include <stdint.h>

#include <time.h>

#include <sys/types.h>

#include <binder/IPCThreadState.h>

    Vector<wp<IMediaSource>> tracks;

    Vector<String8> trackDescriptions;

    String8 toString() const;

    time_t when;

} ExtractorInstance;

String8 ExtractorInstance::toString() const {

    String8 str = name;

    String8 str;

    char timeString[32];

    strftime(timeString, sizeof(timeString), "%m-%d %T", localtime(&when));

    str.append(timeString);

    str.append(": ");

    str.append(name);

    str.append(" for mime ");

    str.append(mime);

    str.append(", source ");

    ex.sourceDescription = source->toString();

    ex.owner = IPCThreadState::self()->getCallingPid();

    ex.extractor = extractor;

    ex.when = time(NULL);

    {

        Mutex::Autolock lock(sExtractorsLock);