Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

core/html/canvas/OffscreenCanvas.idl

Index: core/html/canvas/OffscreenCanvas.idl
diff --git a/core/html/canvas/OffscreenCanvas.idl b/core/html/canvas/OffscreenCanvas.idl
new file mode 100644
index 0000000000000000000000000000000000000000..be5bf9128569e7bf0702354f142c44a037338a56
--- /dev/null
+++ b/core/html/canvas/OffscreenCanvas.idl
@@ -0,0 +1,13 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+    Constructor([EnforceRange] unsigned long width, [EnforceRange] unsigned long height),
+    GarbageCollected,
+    Exposed=(Window,Worker),
+    RuntimeEnabled=ExperimentalCanvasFeatures,
+] interface OffscreenCanvas {
+    [EnforceRange] attribute unsigned long width;
+    [EnforceRange] attribute unsigned long height;
+};