Add W3C encrypted-media tests

third_party/WebKit/LayoutTests/imported/wpt/encrypted-media/polyfill/make-polyfill-tests.py

+#!/usr/bin/python
+import os, re, os.path, glob
+
+head = re.compile( r"^(\s*</head>)", re.MULTILINE )
+runtest = re.compile( r"runTest\(\s*(\S.*?)\s*\)", re.DOTALL )
+
+scripts = '''
+    <!-- Polyfill files (NOTE: These are added by auto-generation script) -->
+    <script src=/encrypted-media/polyfill/chrome-polyfill.js></script>
+    <script src=/encrypted-media/polyfill/firefox-polyfill.js></script>
+    <script src=/encrypted-media/polyfill/edge-persistent-usage-record.js></script>
+    <script src=/encrypted-media/polyfill/edge-keystatuses.js></script>
+    <script src=/encrypted-media/polyfill/clearkey-polyfill.js></script>'''
+
+def process_file( infile, outfile ) :
+    with open( outfile, "w" ) as output :
+        with open( infile, "r" ) as input :
+            output.write( runtest.sub( r"runTest( \1, 'polyfill: ' )", head.sub( scripts + r"\1", input.read() ) ) )
+
+if __name__ == '__main__' :
+    if (not os.getcwd().endswith('polyfill')) :
+        print "Please run from polyfill directory"
+        exit( 1 )
+
+    for infile in glob.glob( "../*.html" ) :
+        process_file( infile, os.path.basename( infile ) )
+
+    for infile in glob.glob( "../resources/*.html" ) :
+        process_file( infile, os.path.join( "resources", os.path.basename( infile ) ) )