Adds filter support for offscreen canvas

third_party/WebKit/Source/core/style/SVGComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/SVGComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/SVGComputedStyle.cpp b/third_party/WebKit/Source/core/style/SVGComputedStyle.cpp
index 1034cbcb90a6331a44cd31bdc9c9fbbc4787c701..67a057f7b163aedbebf5f1933ebb575579241fc9 100644
--- a/third_party/WebKit/Source/core/style/SVGComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/SVGComputedStyle.cpp
@@ -33,7 +33,13 @@ static const int kPaintOrderBitwidth = 2;
 
 SVGComputedStyle::SVGComputedStyle()
 {
-    static SVGComputedStyle* initialStyle = new SVGComputedStyle(CreateInitial);
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<SVGComputedStyle*>, style,

[esprehn, 2016/09/12 20:53:12]

ditto

+        new ThreadSpecific<SVGComputedStyle*>);
+    if (!*style) {
+        *style = new SVGComputedStyle(CreateInitial);
+    }
+
+    SVGComputedStyle* initialStyle = *style;
 
     fill = initialStyle->fill;
     stroke = initialStyle->stroke;
@@ -124,8 +130,12 @@ void SVGComputedStyle::copyNonInheritedFromCached(const SVGComputedStyle* other)
 
 PassRefPtr<SVGDashArray> SVGComputedStyle::initialStrokeDashArray()
 {
-    DEFINE_STATIC_REF(SVGDashArray, initialDashArray, SVGDashArray::create());
-    return initialDashArray;
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<SVGDashArray*>, initialDashArray,
+        new ThreadSpecific<SVGDashArray*>());
+    if (!*initialDashArray) {
+        *initialDashArray = SVGDashArray::create().leakRef();
+    }
+    return *initialDashArray;
 }
 
 StyleDifference SVGComputedStyle::diff(const SVGComputedStyle* other) const