https://bugs.webkit.org/show_bug.cgi?id=123600

Reviewed by Anders Carlsson.

* Configurations/WebKit2.xcconfig:
Link WebKit2 against IOSurface.

* Shared/mac/RemoteLayerTreeTransaction.mm:
(WebKit::dumpChangedLayers):
Dump the size of the backing store instead of the pointer of its
SharedBitmap, because that's slightly more useful.

* UIProcess/mac/RemoteLayerTreeHost.mm:
(WebKit::RemoteLayerTreeHost::commit):
If a layer's backing store uses accelerated drawing, hand the IOSurface
to the CALayer for display.

* WebProcess/WebPage/mac/PlatformCALayerRemote.cpp:
(PlatformCALayerRemote::PlatformCALayerRemote):
Initialize contentsScale to 1 to match CA. Other properties will follow.

(PlatformCALayerRemote::ensureBackingStore):
Instead of replacing the RemoteLayerBackingStore when its properties
change, allow it to update them on the fly. Replacing them caused
us to throw away repaint rects when the accelerated drawing
flag was flipped.

(PlatformCALayerRemote::acceleratesDrawing):
(PlatformCALayerRemote::setAcceleratesDrawing):
Store the accelerated drawing flag and mark it dirty when it changes.

* WebProcess/WebPage/mac/PlatformCALayerRemote.h:
* WebProcess/WebPage/mac/RemoteLayerBackingStore.h:
(WebKit::RemoteLayerBackingStore::image):
Rename bitmap() to image() and have it create a CGImageRef from
the ShareableBitmap, ready for direct application to a CALayer.

(WebKit::RemoteLayerBackingStore::surface):
Return a IOSurface ready for direct application to a CALayer.

(WebKit::RemoteLayerBackingStore::acceleratesDrawing):
(WebKit::RemoteLayerBackingStore::hasFrontBuffer):
Return whether or not we have a front buffer/surface.

* WebProcess/WebPage/mac/RemoteLayerBackingStore.mm:
Forward-declare some CGIOSurface SPI.

(RemoteLayerBackingStore::RemoteLayerBackingStore):
(RemoteLayerBackingStore::ensureBackingStore):
Throw away our front image and reset flags if needed.

(RemoteLayerBackingStore::encode):
(RemoteLayerBackingStore::decode):
En/decode the front surface instead of the ShareableBitmap if needed,
using CoreIPC::MachPort. Destroy the port on receipt.

(createIOSurfaceContext):
Create a CGIOSurfaceContext from an IOSurface.

(createIOSurface):
Create an IOSurface of the given size.

(RemoteLayerBackingStore::image):
Return a CGImageRef, if we're not using accelerated drawing.
Moved from the header.

(RemoteLayerBackingStore::display):
(RemoteLayerBackingStore::drawInContext):
If using accelerated drawing, create and paint into an IOSurface.
Reorganize some code to make the copying-from-the-front-image code
work for both software and IOSurfaces.
Flush the context when completed, to ensure that any asynchronous
painting is complete before we vend the surface to the UI process.

* WebCore.exp.in:
Export sRGBColorSpaceRef.

* WebCore.xcodeproj/project.pbxproj:
Expose GraphicsContextCG.h.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158417 268f45cc-cd09-0410-ab3c-d52691b4dbfc