https://bugs.webkit.org/show_bug.cgi?id=93335

Reviewed by Adrienne Walker.

Source/Platform:

Add APIs to control scrolling behavior on WebScrollableLayer.

* chromium/public/WebScrollableLayer.h:
(WebScrollableLayer):

Source/WebCore:

This converts the PlatformLayer typedef to WebKit::WebLayer (part of the chromium Platform API) for the
Chromium port. This involves some odd const_cast<>s in places since cross-platform interfaces assume that
PlatformLayer is a potentially heavy implementation class, but WebLayer is a thin smart pointer type.

* page/scrolling/chromium/ScrollingCoordinatorChromium.cpp:
(WebCore::createScrollbarLayer):
(WebCore::ScrollingCoordinator::setScrollLayer):
(WebCore::ScrollingCoordinator::setNonFastScrollableRegion):
(WebCore::ScrollingCoordinator::setLayerIsContainerForFixedPositionLayers):
(WebCore::ScrollingCoordinator::setLayerIsFixedToContainerLayer):
* platform/graphics/PlatformLayer.h:
(WebKit):
(WebCore):
* platform/graphics/chromium/Canvas2DLayerBridge.cpp:
(WebCore::Canvas2DLayerBridge::layer):
* platform/graphics/chromium/Canvas2DLayerBridge.h:
(Canvas2DLayerBridge):
* platform/graphics/chromium/DrawingBufferChromium.cpp:
(WebCore::DrawingBufferPrivate::layer):
* platform/graphics/chromium/GraphicsLayerChromium.cpp:
(WebCore::GraphicsLayerChromium::removeFromParent):
(WebCore::GraphicsLayerChromium::setDrawsContent):
(WebCore::GraphicsLayerChromium::setContentsVisible):
(WebCore::GraphicsLayerChromium::setMaskLayer):
(WebCore::GraphicsLayerChromium::setContentsToCanvas):
(WebCore::GraphicsLayerChromium::setContentsToMedia):
(WebCore::GraphicsLayerChromium::primaryLayer):
(WebCore::GraphicsLayerChromium::platformLayer):
(WebCore::GraphicsLayerChromium::updateChildList):
* platform/graphics/chromium/GraphicsLayerChromium.h:
(GraphicsLayerChromium):

Source/WebKit/chromium:

Update for new PlatformLayer typedef. This removes knowledge of WebCore::LayerChromium from all classes
except for NonCompositedContentHost, which still punches through for a few minor APIs that I'll address
in a separate patch.

* src/NonCompositedContentHost.cpp:
(WebKit::NonCompositedContentHost::NonCompositedContentHost):
(WebKit::NonCompositedContentHost::setScrollLayer):
(WebKit::NonCompositedContentHost::scrollLayer):
(WebKit::NonCompositedContentHost::notifySyncRequired):
* src/WebMediaPlayerClientImpl.cpp:
(WebKit::WebMediaPlayerClientImpl::platformLayer):
* src/WebMediaPlayerClientImpl.h:
(WebMediaPlayerClientImpl):
* src/WebPluginContainerImpl.cpp:
(WebKit::WebPluginContainerImpl::platformLayer):
* src/WebPluginContainerImpl.h:
(WebCore):
(WebPluginContainerImpl):
* src/WebScrollableLayer.cpp:
(WebKit::WebScrollableLayer::setNonFastScrollableRegion):
(WebKit):
(WebKit::WebScrollableLayer::setIsContainerForFixedPositionLayers):
(WebKit::WebScrollableLayer::setFixedToContainerLayer):
* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::setRootGraphicsLayer):
* tests/Canvas2DLayerBridgeTest.cpp:
* tests/GraphicsLayerChromiumTest.cpp:
(WebKitTests::GraphicsLayerChromiumTest::GraphicsLayerChromiumTest):
(WebKitTests::TEST_F):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@124927 268f45cc-cd09-0410-ab3c-d52691b4dbfc