code/Debug/Model/Block.php
public function completeRendering(Mage_Core_Block_Abstract $block)
    {
        $this->isRendering = false;
        $this->renderedCompletedAt = microtime(true);
        $this->renderedDuration += ($this->renderedCompletedAt * 1000 - $this->renderedAt * 1000);
        $this->templateFile = $block instanceof Mage_Core_Block_Template ? $block->getTemplateFile() : '';

        self::$endRenderingTime = $this->renderedCompletedAt;
    }
public function completeRendering(Mage_Core_Block_Abstract $block)
    {
        $this->isRendering = false;
        $this->renderedCompletedAt = microtime(true);
        $this->renderedDuration += ($this->renderedCompletedAt * 1000 - $this->renderedAt * 1000);
        $this->templateFile = $block instanceof Mage_Core_Block_Template ? $block->getTemplateFile() : '';

        self::$endRenderingTime = $this->renderedCompletedAt;
    }
Captures rendering completion for specified block

@param Mage_Core_Block_Abstract $block