Bug 1253219 - Add reftest screenshots to html report for easier debugging. r=jmaher

        self.test_count[status_name] += 1

        if status in ['SKIP', 'FAIL', 'ERROR']:

            if debug.get('screenshot'):

                screenshot = 'data:image/png;base64,%s' % debug['screenshot']

            for image_name in ['screenshot', 'image1', 'image2']:

                if debug.get(image_name):

                    screenshot = '%s' % debug[image_name]

                    # screenshot from gaia unit test doesn't has the datatype

                    # string

                    if not screenshot.startswith('data:image/png;base64,'):

                        screenshot = 'data:image/png;base64,' + screenshot

                    additional_html.append(html.div(

                        html.a(html.img(src=screenshot), href="#"),

                        class_='screenshot'))

            for name, content in debug.items():

                if 'screenshot' in name:

                    href = '#'

                if name in ['screenshot', 'image1', 'image2']:

                    if not content.startswith('data:image/png;base64,'):

                        href = 'data:image/png;base64,%s' % content

                    else:

                        href = content

                else:

                    # use base64 to avoid that some browser (such as Firefox, Opera)

                    # treats '#' as the start of another link if the data URL contains.