[chromium] Revise zoom animator backend to use full transform instead of just scale.

[chromium] Revise zoom animator backend to use full transform instead of just scale.
https://bugs.webkit.org/show_bug.cgi?id=68535

Reviewed by Kenneth Russell.

Source/WebCore:

* page/Settings.cpp:
(WebCore::Settings::Settings):
* page/Settings.h:
(WebCore::Settings::setZoomAnimatorScale):
(WebCore::Settings::zoomAnimatorScale):
(WebCore::Settings::setZoomAnimatorPosition):
(WebCore::Settings::zoomAnimatorPosX):
(WebCore::Settings::zoomAnimatorPosY):
* platform/graphics/chromium/LayerRendererChromium.cpp:
(WebCore::LayerRendererChromium::LayerRendererChromium):
(WebCore::LayerRendererChromium::drawLayersInternal):
* platform/graphics/chromium/LayerRendererChromium.h:
(WebCore::LayerRendererChromium::setZoomAnimatorTransform):
* platform/graphics/chromium/cc/CCLayerTreeHost.cpp:
(WebCore::CCLayerTreeHost::CCLayerTreeHost):
(WebCore::CCLayerTreeHost::commitTo):
(WebCore::CCLayerTreeHost::setZoomAnimatorTransform):
(WebCore::CCLayerTreeHost::updateLayers):
* platform/graphics/chromium/cc/CCLayerTreeHost.h:
* platform/graphics/chromium/cc/CCLayerTreeHostImpl.cpp:
(WebCore::CCLayerTreeHostImpl::setZoomAnimatorTransform):
* platform/graphics/chromium/cc/CCLayerTreeHostImpl.h:
* testing/Internals.cpp:
(WebCore::Internals::setZoomAnimatorTransform):
* testing/Internals.h:
* testing/Internals.idl:

Source/WebKit/chromium:

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::setZoomLevel):
(WebKit::WebViewImpl::setRootLayerNeedsDisplay):

LayoutTests:

* platform/chromium-gpu-linux/platform/chromium/compositing/zoom-animator-scale-test-expected.png: Added.
* platform/chromium/compositing/zoom-animator-scale-test.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95988 268f45cc-cd09-0410-ab3c-d52691b4dbfc