Backed out changeset c2c0405ddf93 (bug 1180916) for causing various e10s mochitest failures.

browser/base/content/tabbrowser.xml

@@ -3086,29 +3086,6 @@
             STATE_LOADED: 2,
             STATE_UNLOADING: 3,
 
-            _suppressor: {
-              _dwu: null,
-              _count: 0,
-              init: function() {
-                this._dwu = window.QueryInterface(Ci.nsIInterfaceRequestor)
-                                  .getInterface(Ci.nsIDOMWindowUtils);
-              },
-              destroy: function() {
-                while (this._count > 0) {
-                  this.unsuppress();
-                }
-                this._dwu = null;
-              },
-              suppress: function() {
-                this._dwu.suppressPaintingGlobally();
-                this._count++;
-              },
-              unsuppress: function() {
-                this._dwu.unsuppressPaintingGlobally();
-                this._count--;
-              }
-            },
-
             getTabState: function(tab) {
               let state = this.tabState.get(tab);
               if (state === undefined) {
@@ -3145,7 +3122,6 @@
               window.addEventListener("MozLayerTreeCleared", this);
               window.addEventListener("TabRemotenessChange", this);
               this.setTabState(this.requestedTab, this.STATE_LOADED);
-              this._suppressor.init();
             },
 
             destroy: function() {
@@ -3156,7 +3132,6 @@
               window.removeEventListener("MozLayerTreeReady", this);
               window.removeEventListener("MozLayerTreeCleared", this);
               window.removeEventListener("TabRemotenessChange", this);
-              this._suppressor.destroy();
 
               this.tabbrowser._switcher = null;
             },
@@ -3269,11 +3244,7 @@
 
               // loadingTab can be non-null here if we timed out loading the current tab.
               // In that case we just overwrite it with a different tab; it's had its chance.
-              if (this.loadingTab == null) {
-                this._suppressor.suppress();
-              }
               this.loadingTab = this.requestedTab;
-
               this.log("Loading tab " + this.tinfo(this.loadingTab));
 
               this.setTabState(this.requestedTab, this.STATE_LOADING);
@@ -3406,7 +3377,6 @@
                 clearTimeout(this.loadTimer);
                 this.loadTimer = null;
                 this.loadingTab = null;
-                this._suppressor.unsuppress();
               }
             },
 

dom/base/nsDOMWindowUtils.cpp

@@ -3119,34 +3119,6 @@ nsDOMWindowUtils::GetPaintingSuppressed(bool *aPaintingSuppressed)
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsDOMWindowUtils::SuppressPaintingGlobally()
-{
-  NS_ENSURE_TRUE(nsContentUtils::IsCallerChrome(), NS_ERROR_FAILURE);
-
-  nsPresContext* presContext = GetPresContext();
-  if (!presContext) {
-    return NS_ERROR_FAILURE;
-  }
-
-  presContext->GetRootPresContext()->RefreshDriver()->Freeze();
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsDOMWindowUtils::UnsuppressPaintingGlobally()
-{
-  NS_ENSURE_TRUE(nsContentUtils::IsCallerChrome(), NS_ERROR_FAILURE);
-
-  nsPresContext* presContext = GetPresContext();
-  if (!presContext) {
-    return NS_ERROR_FAILURE;
-  }
-
-  presContext->GetRootPresContext()->RefreshDriver()->Thaw();
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsDOMWindowUtils::GetPlugins(JSContext* cx, JS::MutableHandle<JS::Value> aPlugins)
 {

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -49,7 +49,7 @@ interface nsIJSRAIIHelper;
 interface nsIContentPermissionRequest;
 interface nsIObserver;
 
-[scriptable, uuid(5c4c391c-e083-4d95-95f0-5820c8308445)]
+[scriptable, uuid(6064615a-a782-4d08-86db-26ef3851208a)]
 interface nsIDOMWindowUtils : nsISupports {
 
   /**
@@ -1607,17 +1607,6 @@ interface nsIDOMWindowUtils : nsISupports {
    */
   readonly attribute boolean paintingSuppressed;
 
-  /**
-   * Suppress painting by freezing the refresh driver.
-   **/
-  void suppressPaintingGlobally();
-
-  /**
-   * Unsuppress painting by thawing the refresh driver.
-   **/
-  void unsuppressPaintingGlobally();
-
-
   /**
    * Returns an array of plugins on the page for opt-in activation.
    *