Update web-platform-tests and CSS tests.

- Update CSS tests to revision e05bfd5e30ed662c2f8a353577003f8eed230180.
- Update web-platform-tests to revision a052787dd5c069a340031011196b73affbd68cd9.

tests/wpt/web-platform-tests/2dcontext/tools/build.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+set -ex
+
+cd "${0%/*}"
+virtualenv -p python .virtualenv
+.virtualenv/bin/pip install pyyaml cairocffi
+.virtualenv/bin/python gentest.py

tests/wpt/web-platform-tests/2dcontext/tools/gentestutils.py

@@ -45,7 +45,10 @@ import sys
 import xml.dom.minidom
 from xml.dom.minidom import Node
 
-import cairo
+try:
+    import cairocffi as cairo
+except ImportError:
+    import cairo
 
 try:
     import syck as yaml # compatible and lots faster

tests/wpt/web-platform-tests/2dcontext/tools/name2dir.yaml

@@ -41,5 +41,6 @@ fallback:                             "../html/semantics/embedded-content/the-ca
 initial:                              "../html/semantics/embedded-content/the-canvas-element/"
 security:                             "../html/semantics/embedded-content/the-canvas-element/"
 size:                                 "../html/semantics/embedded-content/the-canvas-element/"
+toBlob:                               "../html/semantics/embedded-content/the-canvas-element/"
 toDataURL:                            "../html/semantics/embedded-content/the-canvas-element/"
 type:                                 "../html/semantics/embedded-content/the-canvas-element/"

tests/wpt/web-platform-tests/2dcontext/tools/tests.yaml

@@ -566,9 +566,13 @@
   testing:
     - toDataURL.noarguments
   code: |
-    var canvas2 = document.createElement('canvas');
-    var data = canvas2.toDataURL();
-    @assert data =~ /^data:image\/png[;,]/;
+    var no_context_data = canvas.toDataURL();
+    var ctx = canvas.getContext('2d');
+    ctx.rect(0, 0, 100, 50);
+    ctx.fillStyle = "rgba(0, 0, 0, 0)";
+    ctx.fill();
+    var data = canvas.toDataURL();
+    assert_equals(no_context_data, data);
 
 - name: toDataURL.zerosize
   desc: toDataURL on zero-size canvas returns 'data:,'