Bug 786419 - Part 6 - Disable HTMLDNSPrefetches for offline apps r=jduell

content/html/content/src/nsHTMLDNSPrefetch.cpp

@@ -94,6 +94,10 @@ nsHTMLDNSPrefetch::Shutdown()
 bool
 nsHTMLDNSPrefetch::IsAllowed (nsIDocument *aDocument)
 {
+  if (NS_IsAppOffline(aDocument->NodePrincipal())) {
+    return false;
+  }
+
   // There is no need to do prefetch on non UI scenarios such as XMLHttpRequest.
   return aDocument->IsDNSPrefetchAllowed() && aDocument->GetWindow();
 }

dom/ipc/PBrowser.ipdl

@@ -539,6 +539,11 @@ child:
      */
     UIResolutionChanged();
 
+    /**
+     * Tell the child of an app's offline status
+     */
+    AppOfflineStatus(uint32_t id, bool offline);
+
 /*
  * FIXME: write protocol!
 

dom/ipc/TabChild.cpp

@@ -80,6 +80,7 @@
 #include "UnitTransforms.h"
 #include "ClientLayerManager.h"
 #include "LayersLogging.h"
+#include "nsIOService.h"
 
 #include "nsColorPickerProxy.h"
 
@@ -2572,6 +2573,18 @@ TabChild::RecvAsyncMessage(const nsString& aMessage,
   return true;
 }
 
+bool
+TabChild::RecvAppOfflineStatus(const uint32_t& aId, const bool& aOffline)
+{
+  // Instantiate the service to make sure gIOService is initialized
+  nsCOMPtr<nsIIOService> ioService = mozilla::services::GetIOService();
+  if (gIOService && ioService) {
+    gIOService->SetAppOfflineInternal(aId, aOffline ?
+      nsIAppOfflineInfo::OFFLINE : nsIAppOfflineInfo::ONLINE);
+  }
+  return true;
+}
+
 class UnloadScriptEvent : public nsRunnable
 {
 public:

dom/ipc/TabChild.h

@@ -374,6 +374,8 @@ public:
                                   const InfallibleTArray<CpowEntry>& aCpows,
                                   const IPC::Principal& aPrincipal) MOZ_OVERRIDE;
 
+    virtual bool RecvAppOfflineStatus(const uint32_t& aId, const bool& aOffline) MOZ_OVERRIDE;
+
     virtual PDocumentRendererChild*
     AllocPDocumentRendererChild(const nsRect& documentRect, const gfx::Matrix& transform,
                                 const nsString& bgcolor,

dom/ipc/TabParent.cpp

@@ -240,6 +240,7 @@ TabParent::TabParent(nsIContentParent* aManager, const TabContext& aContext, uin
   , mMarkedDestroying(false)
   , mIsDestroyed(false)
   , mAppPackageFileDescriptorSent(false)
+  , mSendOfflineStatus(true)
   , mChromeFlags(aChromeFlags)
 {
   MOZ_ASSERT(aManager);
@@ -499,6 +500,14 @@ TabParent::LoadURL(nsIURI* aURI)
         return;
     }
 
+    uint32_t appId = OwnOrContainingAppId();
+    if (mSendOfflineStatus && NS_IsAppOffline(appId)) {
+      // If the app is offline in the parent process
+      // pass that state to the child process as well
+      unused << SendAppOfflineStatus(appId, true);
+    }
+    mSendOfflineStatus = false;
+
     unused << SendLoadURL(spec);
 
     // If this app is a packaged app then we can speed startup by sending over

dom/ipc/TabParent.h

@@ -428,6 +428,10 @@ private:
     // Whether we have already sent a FileDescriptor for the app package.
     bool mAppPackageFileDescriptorSent;
 
+    // Whether we need to send the offline status to the TabChild
+    // This is true, until the first call of LoadURL
+    bool mSendOfflineStatus;
+
     uint32_t mChromeFlags;
 
     nsCOMPtr<nsILoadContext> mLoadContext;