Oilpan: "Move" ElementStyleResources to the oilpan heap.

ElementStyleResources are only allocated as a part object of another stack allocated object so we don't need
to use persistent heap collections as the entries will be marked conservatively via the stack.

R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, oilpan-reviews@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
BUG=341815

Review URL: https://codereview.chromium.org/208053004

git-svn-id: svn://svn.chromium.org/blink/trunk@169838 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/css/resolver/CSSToStyleMap.h

@@ -44,10 +44,10 @@ class BorderImageLengthBox;
 // CSSValue objects into their RenderStyle equivalents.
 
 class CSSToStyleMap {
+    STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(CSSToStyleMap);
 public:
     CSSToStyleMap(const StyleResolverState& state, ElementStyleResources& elementStyleResources) : m_state(state), m_elementStyleResources(elementStyleResources) { }
-
     void mapFillAttachment(CSSPropertyID, FillLayer*, CSSValue*) const;
     void mapFillClip(CSSPropertyID, FillLayer*, CSSValue*) const;
     void mapFillComposite(CSSPropertyID, FillLayer*, CSSValue*) const;

third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h

@@ -41,12 +41,13 @@ class FilterOperation;
 class StyleImage;
 class TextLinkColors;
 
-typedef WillBePersistentHeapHashMap<FilterOperation*, RefPtrWillBeMember<CSSSVGDocumentValue> > PendingSVGDocumentMap;
-typedef WillBePersistentHeapHashMap<CSSPropertyID, RefPtrWillBeMember<CSSValue> > PendingImagePropertyMap;
+typedef WillBeHeapHashMap<FilterOperation*, RefPtrWillBeMember<CSSSVGDocumentValue> > PendingSVGDocumentMap;
+typedef WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<CSSValue> > PendingImagePropertyMap;
 
 // Holds information about resources, requested by stylesheets.
 // Lifetime: per-element style resolve.
 class ElementStyleResources {
+STACK_ALLOCATED();
 WTF_MAKE_NONCOPYABLE(ElementStyleResources);
 public:
     ElementStyleResources();