Introduce HAVE(IOSURFACE_ACCELERATOR)

Introduce HAVE(IOSURFACE_ACCELERATOR)
https://bugs.webkit.org/show_bug.cgi?id=182955
<rdar://problem/37699510>

Reviewed by Sam Weinig.

Source/WebCore:

No new tests, no change in behavior.

Introduce HAVE(IOSURFACE_ACCELERATOR) and guard all uses of
IOSurfaceAccelerator behind it.

Rename USE(IOSURFACE) to HAVE(IOSURFACE) for accuracy.

* page/cocoa/MemoryReleaseCocoa.mm:
* platform/graphics/ca/TileController.cpp:
* platform/graphics/cg/IOSurfacePool.cpp:
* platform/graphics/cg/IOSurfacePool.h:
* platform/graphics/cg/ImageBufferCG.cpp:
* platform/graphics/cocoa/IOSurface.h:
* platform/graphics/cocoa/IOSurface.mm:
* platform/graphics/cocoa/IOSurfacePoolCocoa.mm:
* platform/graphics/cv/VideoTextureCopierCV.cpp:
* platform/graphics/cv/VideoTextureCopierCV.h:

Source/WebCore/PAL:

* pal/spi/cg/CoreGraphicsSPI.h:
* pal/spi/cocoa/IOSurfaceSPI.h:
* pal/spi/cocoa/QuartzCoreSPI.h:

Source/WebKit:

* Shared/RemoteLayerTree/RemoteLayerBackingStore.h:
* Shared/RemoteLayerTree/RemoteLayerBackingStore.mm:
* Shared/cg/ShareableBitmapCG.cpp:
* UIProcess/API/Cocoa/WKWebView.mm:
* UIProcess/RemoteLayerTree/RemoteLayerTreeDrawingAreaProxy.mm:
* UIProcess/RemoteLayerTree/RemoteLayerTreeHost.mm:
* UIProcess/mac/ViewSnapshotStore.h:
* UIProcess/mac/ViewSnapshotStore.mm:

Source/WTF:

* wtf/Platform.h:

Tools:

* DumpRenderTree/ios/PixelDumpSupportIOS.mm:
(createBitmapContextFromWebView):
* WebKitTestRunner/ios/PlatformWebViewIOS.mm:
(WTR::PlatformWebView::windowSnapshotImage):

WebKitLibraries:

* WebKitPrivateFrameworkStubs/iOS/10/IOSurface.framework/IOSurface.tbd:
* WebKitPrivateFrameworkStubs/iOS/10/IOSurfaceAccelerator.framework/IOSurfaceAccelerator.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/11/IOSurfaceAccelerator.framework/IOSurfaceAccelerator.tbd: Added.
Switch IOSurfaceAccelerator symbols over to the still-private IOSurfaceAccelerator framework.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@228853 268f45cc-cd09-0410-ab3c-d52691b4dbfc