Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

public/web/WebSettings.h

Index: public/web/WebSettings.h
diff --git a/public/web/WebSettings.h b/public/web/WebSettings.h
index 8f303d0e63241d222004a7528874c33fe7206b7f..d62f2f81f3663c2e176bfb5184282197f82a09e3 100644
--- a/public/web/WebSettings.h
+++ b/public/web/WebSettings.h
@@ -45,6 +45,12 @@ class WebURL;
 // these functions have a 1:1 mapping with the methods in WebCore/page/Settings.h.
 class WebSettings {
 public:
+    enum AnimatedImageType {
+        AnimatedImageTypeNone,
+        AnimatedImageTypeOnce,
+        AnimatedImageTypeNormal
+    };
+
     enum EditingBehavior {
         EditingBehaviorMac,
         EditingBehaviorWin,
@@ -160,6 +166,7 @@ public:
     virtual void setHyperlinkAuditingEnabled(bool) = 0;
     virtual void setIgnoreMainFrameOverflowHiddenQuirk(bool) = 0;
     virtual void setImagesEnabled(bool) = 0;
+    virtual void setAnimatedImageType(AnimatedImageType) = 0;
     virtual void setInlineTextBoxAccessibilityEnabled(bool) = 0;
     virtual void setJavaEnabled(bool) = 0;
     virtual void setJavaScriptCanAccessClipboard(bool) = 0;