Bug 1578624 - P11: Add a flag to ask the parent to not actually load the URI when opening a window, since we'll do it ourselves anyway. r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D47867

browser/base/content/browser.js

@@ -6469,7 +6469,8 @@ nsBrowserAccess.prototype = {
     aTriggeringPrincipal = null,
     aNextRemoteTabId = 0,
     aName = "",
-    aCsp = null
+    aCsp = null,
+    aSkipLoad = false
   ) {
     let win, needToFocusWin;
 
@@ -6508,6 +6509,7 @@ nsBrowserAccess.prototype = {
       nextRemoteTabId: aNextRemoteTabId,
       name: aName,
       csp: aCsp,
+      skipLoad: aSkipLoad,
     });
     let browser = win.gBrowser.getBrowserForTab(tab);
 
@@ -6532,7 +6534,8 @@ nsBrowserAccess.prototype = {
       aWhere,
       aFlags,
       aTriggeringPrincipal,
-      aCsp
+      aCsp,
+      true
     );
   },
 
@@ -6547,7 +6550,8 @@ nsBrowserAccess.prototype = {
       aWhere,
       aFlags,
       aTriggeringPrincipal,
-      aCsp
+      aCsp,
+      false
     );
   },
 
@@ -6557,7 +6561,8 @@ nsBrowserAccess.prototype = {
     aWhere,
     aFlags,
     aTriggeringPrincipal,
-    aCsp
+    aCsp,
+    aSkipLoad
   ) {
     // This function should only ever be called if we're opening a URI
     // from a non-remote browser window (via nsContentTreeOwner).
@@ -6687,7 +6692,8 @@ nsBrowserAccess.prototype = {
           aTriggeringPrincipal,
           0,
           "",
-          aCsp
+          aCsp,
+          aSkipLoad
         );
         if (browser) {
           browsingContext = browser.browsingContext;
@@ -6725,14 +6731,17 @@ nsBrowserAccess.prototype = {
     aNextRemoteTabId,
     aName
   ) {
-    // Passing a null-URI to only create the content window.
+    // Passing a null-URI to only create the content window,
+    // and pass true for aSkipLoad to prevent loading of
+    // about:blank
     return this.getContentWindowOrOpenURIInFrame(
       null,
       aParams,
       aWhere,
       aFlags,
       aNextRemoteTabId,
-      aName
+      aName,
+      true
     );
   },
 
@@ -6750,7 +6759,8 @@ nsBrowserAccess.prototype = {
       aWhere,
       aFlags,
       aNextRemoteTabId,
-      aName
+      aName,
+      false
     );
   },
 
@@ -6760,7 +6770,8 @@ nsBrowserAccess.prototype = {
     aWhere,
     aFlags,
     aNextRemoteTabId,
-    aName
+    aName,
+    aSkipLoad
   ) {
     if (aWhere != Ci.nsIBrowserDOMWindow.OPEN_NEWTAB) {
       dump("Error: openURIInFrame can only open in new tabs");
@@ -6787,7 +6798,8 @@ nsBrowserAccess.prototype = {
       aParams.triggeringPrincipal,
       aNextRemoteTabId,
       aName,
-      aParams.csp
+      aParams.csp,
+      aSkipLoad
     );
   },
 

browser/base/content/tabbrowser.js

@@ -1612,6 +1612,7 @@
       var aFocusUrlBar;
       var aName;
       var aCsp;
+      var aSkipLoad;
       if (
         arguments.length == 2 &&
         typeof arguments[1] == "object" &&
@@ -1642,6 +1643,7 @@
         aFocusUrlBar = params.focusUrlBar;
         aName = params.name;
         aCsp = params.csp;
+        aSkipLoad = params.skipLoad;
       }
 
       // all callers of loadOneTab need to pass a valid triggeringPrincipal.
@@ -1682,6 +1684,7 @@
         focusUrlBar: aFocusUrlBar,
         name: aName,
         csp: aCsp,
+        skipLoad: aSkipLoad,
       });
       if (!bgLoad) {
         this.selectedTab = tab;
@@ -2094,6 +2097,7 @@
       sameProcessAsFrameLoader,
       uriIsAboutBlank,
       userContextId,
+      skipLoad,
     } = {}) {
       let b = document.createXULElement("browser");
       // Use the JSM global to create the permanentKey, so that if the
@@ -2210,7 +2214,7 @@
 
       // Prevent the superfluous initial load of a blank document
       // if we're going to load something other than about:blank.
-      if (!uriIsAboutBlank) {
+      if (!uriIsAboutBlank || skipLoad) {
         b.setAttribute("nodefaultsrc", "true");
       }
 
@@ -2577,6 +2581,7 @@
         recordExecution,
         replayExecution,
         csp,
+        skipLoad,
       } = {}
     ) {
       // all callers of addTab that pass a params object need to pass
@@ -2810,6 +2815,7 @@
             name,
             recordExecution,
             replayExecution,
+            skipLoad,
           });
         }
 
@@ -2903,7 +2909,8 @@
       // then let's just continue loading the page normally.
       if (
         !usingPreloadedContent &&
-        (!uriIsAboutBlank || !allowInheritPrincipal)
+        (!uriIsAboutBlank || !allowInheritPrincipal) &&
+        !skipLoad
       ) {
         // pretend the user typed this so it'll be available till
         // the document successfully loads

dom/ipc/BrowserChild.cpp

@@ -1445,10 +1445,12 @@ mozilla::ipc::IPCResult BrowserChild::RecvActivate() {
   // is definitely not going to work. GetPresShell should
   // create a PresShell if one doesn't exist yet.
   RefPtr<PresShell> presShell = GetTopLevelPresShell();
-  MOZ_ASSERT(presShell);
+  NS_ASSERTION(presShell, "Need a PresShell to activate!");
   Unused << presShell;
 
-  mWebBrowser->FocusActivate();
+  if (presShell) {
+    mWebBrowser->FocusActivate();
+  }
   return IPC_OK();
 }
 

dom/ipc/ContentChild.cpp

@@ -1134,10 +1134,6 @@ nsresult ContentChild::ProvideWindowCommon(
       }
     }
 
-    if (!urlToLoad.IsEmpty()) {
-      newChild->RecvLoadURL(urlToLoad, showInfo);
-    }
-
     if (xpc::IsInAutomation()) {
       if (nsCOMPtr<nsPIDOMWindowOuter> outer =
               do_GetInterface(newChild->WebNavigation())) {

toolkit/components/windowwatcher/nsWindowWatcher.cpp

@@ -809,14 +809,6 @@ nsresult nsWindowWatcher::OpenWindowInternal(
 
         if (NS_SUCCEEDED(rv) && newBC) {
           nsCOMPtr<nsIDocShell> newDocShell = newBC->GetDocShell();
-          if (windowIsNew && newDocShell) {
-            // Make sure to stop any loads happening in this window that the
-            // window provider might have started.  Otherwise if our caller
-            // manipulates the window it just opened and then the load
-            // completes their stuff will get blown away.
-            nsCOMPtr<nsIWebNavigation> webNav = do_QueryInterface(newDocShell);
-            webNav->Stop(nsIWebNavigation::STOP_NETWORK);
-          }
 
           // If this is a new window, but it's incompatible with the current
           // userContextId, we ignore it and we pretend that nothing has been