https://bugs.webkit.org/show_bug.cgi?id=122523
<rdar://problem/15179463>

Reviewed by Simon Fraser.

Source/WebCore:

Add support for the unprefixed "webgl" canvas context type.

Test: fast/canvas/webgl/unprefixed-context.html

* html/HTMLCanvasElement.cpp:
(WebCore::HTMLCanvasElement::is3dType):
* inspector/InjectedScriptCanvasModuleSource.js:

LayoutTests:

Tests that we can create a context without the
"experimental-" prefix. Meanwhile, most of the other
WebGL tests should start to use the unprefixed
form automatically (the helper script attempts
"webgl" first).

* fast/canvas/webgl/unprefixed-context-expected.txt: Added.
* fast/canvas/webgl/unprefixed-context.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157138 268f45cc-cd09-0410-ab3c-d52691b4dbfc