Merge 136878

Merge 136878
> REGRESSION(r135082): Restore the ability to insert author level style sheets from script
> https://bugs.webkit.org/show_bug.cgi?id=104042
> 
> Reviewed by Antti Koivisto.
> 
> .:
> 
> Update exports for Internals.cpp.
> 
> * Source/autotools/symbols.filter:
> 
> Source/WebCore:
> 
> Add DocumentStyleSheetCollection::addAuthorSheet so embedders can allow scripts
> to insert author level styles. Expose the method to window.interals for testing.
> 
> Test: userscripts/insert-stylesheets.html
> 
> * WebCore.exp.in: Update exports for Internals.cpp.
> * WebCore.order: Update exports for Internals.cpp.
> * dom/DocumentStyleSheetCollection.cpp:
> (WebCore::DocumentStyleSheetCollection::~DocumentStyleSheetCollection):
> (WebCore::DocumentStyleSheetCollection::addAuthorSheet): Add the stylesheet and force a style recalc.
> (WebCore::DocumentStyleSheetCollection::updateActiveStyleSheets): Include author level styles.
> (WebCore::DocumentStyleSheetCollection::reportMemoryUsage): Include author styles.
> * dom/DocumentStyleSheetCollection.h:
> (WebCore::DocumentStyleSheetCollection::documentAuthorStyleSheets): Accessor.
> (DocumentStyleSheetCollection): Keep track of author styles added by script.
> * testing/Internals.cpp:
> (WebCore::Internals::insertAuthorCSS): Testing addAuthorSheet.
> (WebCore::Internals::insertUserCSS): Testing addUserSheet.
> * testing/Internals.h:
> * testing/Internals.idl: Add addAuthorSheet and addUserSheet.
> 
> Source/WebKit/chromium:
> 
> * src/WebDocument.cpp:
> (WebKit::WebDocument::insertUserStyleSheet): Use addAuthorSheet if an author level script is requested.
> 
> Source/WebKit2:
> 
> Update exports for Internals.cpp.
> 
> * win/WebKit2.def.in:
> 
> LayoutTests:
> 
> Add a test that makes sure that an author level style is set.
> 
> * userscripts/insert-stylesheets-expected.txt: Added.
> * userscripts/insert-stylesheets.html: Added.
> 

TBR=tony@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=136960