Bug 832920. Add a way for chrome iframes to opt into having a separate refresh driver (e.g. if they plan to be moved between windows) and make devtools use that opt-in. r=tnikkel,paul

browser/devtools/framework/Toolbox.jsm

@@ -474,6 +474,7 @@ Toolbox.prototype = {
       iframe.className = "toolbox-panel-iframe";
       iframe.id = "toolbox-panel-iframe-" + id;
       iframe.setAttribute("flex", 1);
+      iframe.setAttribute("forceOwnRefreshDriver", "");
 
       let vbox = this.doc.getElementById("toolbox-panel-" + id);
       vbox.appendChild(iframe);

browser/devtools/framework/toolbox-window.xul

@@ -28,5 +28,5 @@
          modifiers="accel"/>
   </keyset>
 
-  <iframe id="toolbox-iframe" flex="1"></iframe>
+  <iframe id="toolbox-iframe" flex="1" forceOwnRefreshDriver=""></iframe>
 </window>

content/base/src/nsGkAtomList.h

@@ -372,6 +372,7 @@ GK_ATOM(fontpicker, "fontpicker")
 GK_ATOM(footer, "footer")
 GK_ATOM(_for, "for")
 GK_ATOM(forEach, "for-each")
+GK_ATOM(forceOwnRefreshDriver, "forceOwnRefreshDriver")
 GK_ATOM(form, "form")
 GK_ATOM(formaction, "formaction")
 GK_ATOM(format, "format")

layout/base/nsPresContext.cpp

@@ -948,7 +948,14 @@ nsPresContext::Init(nsDeviceContext* aDeviceContext)
         nsCOMPtr<nsIDocShellTreeItem> parentItem;
         ourItem->GetSameTypeParent(getter_AddRefs(parentItem));
         if (parentItem) {
-          mRefreshDriver = parent->GetShell()->GetPresContext()->RefreshDriver();
+          Element* containingElement =
+            parent->FindContentForSubDocument(mDocument);
+          if (!containingElement->IsXUL() ||
+              !containingElement->
+                HasAttr(kNameSpaceID_None,
+                        nsGkAtoms::forceOwnRefreshDriver)) {
+            mRefreshDriver = parent->GetShell()->GetPresContext()->RefreshDriver();
+          }
         }
       }
     }