[chromium] Move createOffscreenGraphicsContext3D() from WebKitPlatformSupport to...

[chromium] Move createOffscreenGraphicsContext3D() from WebKitPlatformSupport to Platform
https://bugs.webkit.org/show_bug.cgi?id=86524

Reviewed by Adam Barth.

Source/Platform:

Moves createOffscreenGraphicsContext3D(), previously on WebKitPlatformSupport, to WebKit::Platform.

* chromium/public/Platform.h:
(Platform):
(WebKit::Platform::createOffscreenGraphicsContext3D):

Source/WebKit/chromium:

Moves createOffscreenGraphicsContext3D() out (to WebKit::Platform) and updates GraphicsContext3DChromium to use
the new location. Also removes a few unnecessary includes from GraphicsContext3DChromium.cpp.

* public/platform/WebKitPlatformSupport.h:
(WebKitPlatformSupport):
* src/GraphicsContext3DChromium.cpp:
(WebCore::GraphicsContext3D::create):

Tools:

Updates TestWebPlugin to use the Platform headers and updates the build dependencies so it can.

* DumpRenderTree/DumpRenderTree.gyp/DumpRenderTree.gyp:
* DumpRenderTree/chromium/TestWebPlugin.cpp:
(TestWebPlugin::initialize):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117166 268f45cc-cd09-0410-ab3c-d52691b4dbfc