[chromium] Remove CCLayerDelegate, add ContentLayerDelegate for painting

[chromium] Remove CCLayerDelegate, add ContentLayerDelegate for painting
https://bugs.webkit.org/show_bug.cgi?id=76663

Reviewed by Kenneth Russell.

Source/WebCore:

CCLayerDelegate used to be an interface with a half-dozen callbacks on it, but now it has only one call -
paintContents() - and that one call is only valid for one subclass of LayerChromium, ContentLayerChromium. This
removes the CCLayerDelegate pointer from LayerChromium and adds a ContentLayerDelegate for the paint call.

The majority of the code changes in this patch are removing the nil parameter from various places that construct
LayerChromium instances. Also tightens the type of GraphicsLayerChromium::m_layer to ContentLayerChromium.

Refactoring/removing dead code, so no new tests.

* platform/graphics/chromium/Canvas2DLayerChromium.cpp:
(WebCore::Canvas2DLayerChromium::Canvas2DLayerChromium):
* platform/graphics/chromium/CanvasLayerChromium.cpp:
(WebCore::CanvasLayerChromium::CanvasLayerChromium):
* platform/graphics/chromium/CanvasLayerChromium.h:
* platform/graphics/chromium/ContentLayerChromium.cpp:
(WebCore::ContentLayerPainter::create):
(WebCore::ContentLayerPainter::ContentLayerPainter):
(WebCore::ContentLayerChromium::create):
(WebCore::ContentLayerChromium::ContentLayerChromium):
* platform/graphics/chromium/ContentLayerChromium.h:
(WebCore::ContentLayerDelegate::~ContentLayerDelegate):
(WebCore::ContentLayerChromium::clearDelegate):
* platform/graphics/chromium/DrawingBufferChromium.cpp:
(WebCore::DrawingBuffer::platformLayer):
* platform/graphics/chromium/GraphicsLayerChromium.cpp:
(WebCore::GraphicsLayerChromium::~GraphicsLayerChromium):
(WebCore::GraphicsLayerChromium::setContentsToImage):
(WebCore::GraphicsLayerChromium::setContentsToCanvas):
(WebCore::GraphicsLayerChromium::setContentsToMedia):
(WebCore::GraphicsLayerChromium::updateLayerPreserves3D):
* platform/graphics/chromium/GraphicsLayerChromium.h:
* platform/graphics/chromium/ImageLayerChromium.cpp:
(WebCore::ImageLayerChromium::create):
(WebCore::ImageLayerChromium::ImageLayerChromium):
* platform/graphics/chromium/ImageLayerChromium.h:
* platform/graphics/chromium/LayerChromium.cpp:
(WebCore::LayerChromium::create):
(WebCore::LayerChromium::LayerChromium):
* platform/graphics/chromium/LayerChromium.h:
* platform/graphics/chromium/PluginLayerChromium.cpp:
(WebCore::PluginLayerChromium::create):
(WebCore::PluginLayerChromium::PluginLayerChromium):
* platform/graphics/chromium/PluginLayerChromium.h:
* platform/graphics/chromium/TiledLayerChromium.cpp:
(WebCore::TiledLayerChromium::TiledLayerChromium):
(WebCore::TiledLayerChromium::drawsContent):
* platform/graphics/chromium/TiledLayerChromium.h:
* platform/graphics/chromium/VideoLayerChromium.cpp:
(WebCore::VideoLayerChromium::create):
(WebCore::VideoLayerChromium::VideoLayerChromium):
* platform/graphics/chromium/VideoLayerChromium.h:
* platform/graphics/chromium/WebGLLayerChromium.cpp:
(WebCore::WebGLLayerChromium::create):
(WebCore::WebGLLayerChromium::WebGLLayerChromium):
* platform/graphics/chromium/WebGLLayerChromium.h:

Source/WebKit/chromium:

* src/WebContentLayerImpl.cpp:
(WebKit::WebContentLayerImpl::~WebContentLayerImpl):
* src/WebContentLayerImpl.h:
* src/WebExternalTextureLayerImpl.cpp:
(WebKit::WebExternalTextureLayerImpl::WebExternalTextureLayerImpl):
(WebKit::WebExternalTextureLayerImpl::~WebExternalTextureLayerImpl):
* src/WebExternalTextureLayerImpl.h:
* src/WebLayerImpl.cpp:
(WebKit::WebLayerImpl::WebLayerImpl):
(WebKit::WebLayerImpl::~WebLayerImpl):
* src/WebLayerImpl.h:
* src/WebMediaPlayerClientImpl.cpp:
(WebKit::WebMediaPlayerClientImpl::readyStateChanged):
* src/WebPluginContainerImpl.cpp:
(WebKit::WebPluginContainerImpl::WebPluginContainerImpl):
* tests/CCLayerIteratorTest.cpp:
* tests/CCLayerTreeHostCommonTest.cpp:
(WebCore::LayerChromiumWithForcedDrawsContent::LayerChromiumWithForcedDrawsContent):
(WebCore::TEST):
* tests/CCLayerTreeHostTest.cpp:
(WTF::CCLayerTreeHostTest::doBeginTest):
(WTF::ContentLayerChromiumWithUpdateTracking::create):
(WTF::ContentLayerChromiumWithUpdateTracking::ContentLayerChromiumWithUpdateTracking):
* tests/LayerChromiumTest.cpp:
* tests/TiledLayerChromiumTest.cpp:
(WTF::FakeTiledLayerChromium::FakeTiledLayerChromium):
* tests/TreeSynchronizerTest.cpp:
(WebCore::MockLayerChromium::MockLayerChromium):
(WebCore::TEST):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105460 268f45cc-cd09-0410-ab3c-d52691b4dbfc