Support script modify iframe scrolling, marginWidth and marginHeight attr

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 4ea28a71e472ac90b904ef538954f21f0d609eca..3742bbc2d2a266b6cd04fbe8b085688566faf337 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -4310,6 +4310,17 @@ HTMLFrameOwnerElement* Document::localOwner() const {
   return frame()->deprecatedLocalOwner();
 }
 
+void Document::didChangeFrameOwnerProperties(WTF::Optional<int> marginWidth,
+                                             WTF::Optional<int> marginHeight,

[bokan, 2016/11/21 13:21:52]

Rather than using Optionals here, always pass in the current  values. You can
then compare them to the frame owner's value to see if you need to set/do
layout.

+                                             bool scrollingModeChanged) {
+  if (marginWidth)
+    body()->setIntegralAttribute(marginwidthAttr, marginWidth.value());
+  if (marginHeight)
+    body()->setIntegralAttribute(marginheightAttr, marginHeight.value());
+  if (scrollingModeChanged)
+    view()->setNeedsLayout();
+}
+
 bool Document::isInInvisibleSubframe() const {
   if (!localOwner())
     return false;  // this is a local root element