Add support for the closure compiler webservice, using simple optimizations.

Using this build mode, on a lite build, we save approximately 15% after
gzip. However, this build method can not be used on full builds, as they
exceed the 1000kb limit on the closure compiler webservice. 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@11443 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tools/closure_ws.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+import httplib, urllib, sys
+import time
+# Define the parameters for the POST request and encode them in
+# a URL-safe format.
+
+def minimize(code):
+
+    params = urllib.urlencode([
+        ('js_code', code),
+        ('compilation_level', 'SIMPLE_OPTIMIZATIONS'),
+        ('output_format', 'text'),
+        ('output_info', 'compiled_code'),
+      ])
+    
+    t = time.time()
+    # Always use the following value for the Content-type header.
+    headers = { "Content-type": "application/x-www-form-urlencoded" }
+    conn = httplib.HTTPConnection('closure-compiler.appspot.com')
+    conn.request('POST', '/compile', params, headers)
+    response = conn.getresponse()
+    data = response.read()
+    conn.close()
+    print "%.3f seconds to compile", time.time() - t 
+    return data