SPI to scale a WebView
-and corresponding-
<rdar://problem/8107667>

Reviewed by Darin Adler.

WebCore: 

This patch adds SPI to Mac WebKit that scales the page by the given 
scale factor. The scale factor is factored into the RenderStyle's 
transform.

Set the current pageScale for the document.
* css/CSSStyleSelector.cpp:
(WebCore::CSSStyleSelector::styleForDocument):

Frame keeps track of the page scale factor. When 
scalePage() is called, it modifies the RenderView's style to 
include a transform of the appropriate scale and forces a style 
recalc.
* page/Frame.cpp:
(WebCore::Frame::Frame):
(WebCore::Frame::scalePage):
* page/Frame.h:
(WebCore::Frame::pageScaleFactor):
* WebCore.exp.in:

Add a scale to the transformation matrix.
* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::setPageScaleTransform):
* rendering/style/RenderStyle.h:

WebKit/mac: 

This patch adds SPI to Mac WebKit that scales the page by the given 
scale factor.

* WebView/WebView.mm:
(-[WebView _scaleWebView:]):
(-[WebView _viewScaleFactor]):
* WebView/WebViewPrivate.h:

WebKit2: 

This patch adds SPI to Mac WebKit that scales the page by the given 
scale factor.

Implement scaleWebView(), which tells WebCore::Frame to scale, and 
viewScaleFactor() which returns the current scale factor.
* Shared/API/c/WKSharedAPICast.h:
* UIProcess/API/C/WKPage.cpp:
(WKPageScaleWebView):
(WKPageGetViewScaleFactor):
* UIProcess/API/C/WKPage.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::WebPageProxy):
(WebKit::WebPageProxy::scaleWebView):
* UIProcess/WebPageProxy.h:
(WebKit::WebPageProxy::viewScaleFactor):
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::scaleWebView):
(WebKit::WebPage::viewScaleFactor):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70716 268f45cc-cd09-0410-ab3c-d52691b4dbfc