Adding the 'filter' context attribute to 2D canvas

Source/core/paint/FilterEffectBuilder.cpp

Index: Source/core/paint/FilterEffectBuilder.cpp
diff --git a/Source/core/paint/FilterEffectBuilder.cpp b/Source/core/paint/FilterEffectBuilder.cpp
index 357315fefad6c4f8aa0cadc7eb39064be4751085..9d8df74b3e4b37bd2848db40d24dc3a860b5e669 100644
--- a/Source/core/paint/FilterEffectBuilder.cpp
+++ b/Source/core/paint/FilterEffectBuilder.cpp
@@ -71,10 +71,18 @@ DEFINE_TRACE(FilterEffectBuilder)
     visitor->trace(m_referenceFilters);
 }
 
-bool FilterEffectBuilder::build(LayoutObject* layoutObject, const FilterOperations& operations)
+bool FilterEffectBuilder::build(Element* element, const FilterOperations& operations, ScaleMode scaleMode)
 {
-    const ComputedStyle* style = layoutObject->style();
-    float zoom = style ? style->effectiveZoom() : 1.0f;
+    float zoom = 1.0f;
+    if (scaleMode == ApplyScale) {
+        LayoutObject* layoutObject = element->layoutObject();
+        if (layoutObject) {
+            const ComputedStyle* style = layoutObject->style();
+            if (style) {
+                zoom = style->effectiveZoom();
+            }
+        }
+    }
 
     // Create a parent filter for shorthand filters. These have already been scaled by the CSS code for page zoom, so scale is 1.0 here.
     RefPtrWillBeRawPtr<ReferenceFilter> parentFilter = ReferenceFilter::create(1.0f);
@@ -85,7 +93,7 @@ bool FilterEffectBuilder::build(LayoutObject* layoutObject, const FilterOperatio
         switch (filterOperation->type()) {
         case FilterOperation::REFERENCE: {
             RefPtrWillBeRawPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(zoom);
-            effect = ReferenceFilterBuilder::build(referenceFilter.get(), *layoutObject, previousEffect.get(), toReferenceFilterOperation(*filterOperation));
+            effect = ReferenceFilterBuilder::build(referenceFilter.get(), element, previousEffect.get(), toReferenceFilterOperation(*filterOperation));
             referenceFilter->setLastEffect(effect);
             m_referenceFilters.append(referenceFilter);
             break;