Use Post/Page Title for Subject

add_filter("gform_pre_render", "set_subject");

function set_subject($form){

	//only populating subject field for form id 3
	if($form["id"] != 3)
		return $form;

			$the_title_is = get_the_title($post->ID);

		return $form;
}

add_filter("gform_field_input", "tracker", 10, 5);
function tracker($input, $field, $value, $lead_id, $form_id)
{
      //because this will fire for every form/field, only do it when it is the specific form and field
	if ($form_id == 3 && $field["id"] == 3)
	{
		$input = '<input type="hidden" id="hidTracker" name="hidTracker" value="test">';
		return $input;
	}
}

$agentcontactform = get_post_meta($post->ID, "contactformshortcode_value", true);

?php if (have_posts()) : while (have_posts()) : the_post(); ?>
	<?php
	$agent = "";
	$agent2 = "";
	include get_template_directory() . '/includes/variables.php';
	$contactformsubject = get_the_title();
	?>

$theagent = $agent;
$theagent2 = $agent2; ?>
<?php include get_template_directory() . '/includes/related.php'; ?>

<?php if (get_option('wp_site') == "Real Estate") { ?>
	<?php if (get_option('wp_showcontactform') == "show") { ?>

		<div id="contactagent">

			<?php
				global $wpdb;
				$sql = " SELECT *
				FROM $wpdb->posts AS p
				WHERE p.post_type = 'agent'
				AND p.post_title = '". $theagent ."'";
				$agentarray = $wpdb->get_results($sql);

				$sql2 = " SELECT *
				FROM $wpdb->posts AS p
				WHERE p.post_type = 'agent'
				AND p.post_title = '". $theagent2 ."'";
				$agentarray2 = $wpdb->get_results($sql2);
			?>

			<?php if ($agentarray) { ?>
			<?php foreach ($agentarray as $post) { ?>
				<?php setup_postdata($post); ?>
				<?php include get_template_directory() . '/includes/variables.php' ?>

					<h3>
						<?php echo get_option('wp_agentcontactustext');  ?>
					</h3>
					<div class="agentbox">
						<h4 class="bar"><?php the_title() ?></h4>
						<?php
						$arr_sliderimages = get_gallery_images();
						if ($arr_sliderimages) { ?>
							<?php $resized = aq_resize($arr_sliderimages[0], 80, 100, true); ?>
							<img width="80" height="100" alt="" src="<?php echo $resized ?>" />
						<?php } ?>

						<p>
						<?php if ($agenttitle) { ?>
							<strong><?php echo $agenttitle ?></strong><br />
						<?php } ?>

						<?php if($agentphoneoffice) { ?>
							<?php echo get_option('wp_agentphone1') . ": " . $agentphoneoffice ?><br />
						<?php } ?>

						<?php if($agentphonemobile) { ?>
							<?php echo get_option('wp_agentphone2') . ": " . $agentphonemobile ?><br />
						<?php } ?>

						<?php if($agentfax) { ?>
							<?php echo get_option('wp_agentfax') . ": " . $agentfax ?><br />
						<?php } ?>

						<a href="<?php the_permalink() ?>"><?php echo get_option('wp_otherlistings') ?></a>
						</p>
						<div style="clear: left;"></div>
						<?php if ($agentarray2) { ?>
							<a class="btn btn-block" data-toggle="collapse" data-target="#agent1"><?php echo get_option('wp_contactformbutton_text') ?></a>
							<div id="agent1" class="collapse"><?php echo do_shortcode($agentcontactform); ?></div>

						<?php } else { ?>
							<?php echo do_shortcode($agentcontactform); ?>
						<?php } ?>
					</div>
			<?php } ?>

			<?php } else { ?>

					<h3><?php echo get_option('wp_contactustext') ?></h3>

					<?php echo do_shortcode(stripslashes(get_option('wp_contactshortcode')));  ?>
			<?php } ?>

			<?php if ($agentarray2) { ?>
			<?php foreach ($agentarray2 as $post) { ?>
				<?php setup_postdata($post); ?>
				<?php include get_template_directory() . '/includes/variables.php' ?>

					<div class="agentbox">
					<h4 class="bar"><?php the_title() ?></h4>
						<?php
						$arr_sliderimages = get_gallery_images();
						if ($arr_sliderimages) { ?>
							<?php $resized = aq_resize($arr_sliderimages[0], 80, 100, true); ?>
							<img width="80" height="100" alt="" src="<?php echo $resized ?>" />
						<?php } ?>

						<p>
						<?php if ($agenttitle) { ?>
							<strong><?php echo $agenttitle ?></strong><br />
						<?php } ?>

						<?php if($agentphoneoffice) { ?>
							<?php echo get_option('wp_agentphone1') . ": " . $agentphoneoffice ?><br />
						<?php } ?>

						<?php if($agentphonemobile) { ?>
							<?php echo get_option('wp_agentphone2') . ": " . $agentphonemobile ?><br />
						<?php } ?>

						<?php if($agentfax) { ?>
							<?php echo get_option('wp_agentfax') . ": " . $agentfax ?><br />
						<?php } ?>

						<a href="<?php the_permalink() ?>"><?php echo get_option('wp_otherlistings') ?></a>
						</p>
					<div style="clear: left;"></div>
					<a class="btn btn-block" data-toggle="collapse" data-target="#agent2"><?php echo get_option('wp_contactformbutton_text') ?></a>
					<div id="agent2" class="collapse"><?php echo do_shortcode($agentcontactform); ?></div>
					</div>
			<?php } ?>
			<?php } ?>
			</div><!-- end contact agent -->
<?php }} ?>

<?php if(get_option('wp_site') == "Car Sales") { ?>
	<?php if (get_option('wp_showcontactform') == "show") { ?>
		<div id="listingcontact">
	<?php } ?>
		<h3 class="bar" id="contact"><?php echo stripslashes(get_option('wp_contactustext')); ?></h3>
		<?php echo do_shortcode(stripslashes(get_option('wp_contactshortcode')));  ?>
		</div><!-- end listing contact -->
	<?php } ?>

	<script type="text/javascript">
		$("input[name='your-subject']").val('<?php echo $contactformsubject ?>');
	</script>