Allow SVG images to not taint the canvas with drawImage/drawPattern

Source/core/html/HTMLAnchorElement.cpp

Index: Source/core/html/HTMLAnchorElement.cpp
diff --git a/Source/core/html/HTMLAnchorElement.cpp b/Source/core/html/HTMLAnchorElement.cpp
index efbacc2fa6dbdd9eb2523de19850e42628f0004e..61d4ce158e20e0ab81cb483bd34d62b6cc264aba 100644
--- a/Source/core/html/HTMLAnchorElement.cpp
+++ b/Source/core/html/HTMLAnchorElement.cpp
@@ -48,6 +48,7 @@
 #include "core/platform/network/DNS.h"
 #include "core/platform/network/ResourceRequest.h"
 #include "core/rendering/RenderImage.h"
+#include "core/svg/graphics/SVGImage.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebPrescientNetworking.h"
 #include "public/platform/WebURL.h"
@@ -281,7 +282,7 @@ void HTMLAnchorElement::parseAttribute(const QualifiedName& name, const AtomicSt
 {
     if (name == hrefAttr) {
         bool wasLink = isLink();
-        setIsLink(!value.isNull());
+        setIsLink(!value.isNull() && !shouldProhibitLinks(this));
         if (wasLink != isLink()) {
             didAffectSelector(AffectedSelectorLink | AffectedSelectorVisited | AffectedSelectorEnabled);
             if (wasLink && treeScope()->adjustedFocusedElement() == this) {
@@ -649,6 +650,11 @@ bool isLinkClick(Event* event)
     return event->type() == eventNames().clickEvent && (!event->isMouseEvent() || toMouseEvent(event)->button() != RightButton);
 }
 
+bool shouldProhibitLinks(Element* element)
+{
+    return SVGImage::isInSVGImage(element);
+}
+
 bool HTMLAnchorElement::willRespondToMouseClickEvents()
 {
     return isLink() || HTMLElement::willRespondToMouseClickEvents();