Bug 1112989 - Part 1. Forward know info to ContentChild before app startup. r=fabrice

dom/ipc/ContentParent.cpp

@@ -672,6 +672,8 @@ ContentParent::GetNewOrPreallocatedAppProcess(mozIApplication* aApp,
             }
             process->TransformPreallocatedIntoApp(aOpener,
                                                   manifestURL);
+            process->ForwardKnownInfo();
+
             if (aTookPreAllocated) {
                 *aTookPreAllocated = true;
             }
@@ -688,6 +690,7 @@ ContentParent::GetNewOrPreallocatedAppProcess(mozIApplication* aApp,
                                 /* isForPreallocated = */ false,
                                 aInitialPriority);
     process->Init();
+    process->ForwardKnownInfo();
 
     if (aTookPreAllocated) {
         *aTookPreAllocated = false;
@@ -831,6 +834,7 @@ ContentParent::GetNewOrUsedBrowserProcess(bool aForBrowserElement,
                               aPriority);
         p->Init();
     }
+    p->ForwardKnownInfo();
 
     sNonAppContentParents->AppendElement(p);
     return p.forget();
@@ -1308,6 +1312,15 @@ ContentParent::Init()
     NS_ASSERTION(observer, "FileUpdateDispatcher is null");
 }
 
+void
+ContentParent::ForwardKnownInfo()
+{
+    MOZ_ASSERT(mMetamorphosed);
+    if (!mMetamorphosed) {
+        return;
+    }
+}
+
 namespace {
 
 class SystemMessageHandledListener MOZ_FINAL
@@ -1497,6 +1510,7 @@ ContentParent::TransformPreallocatedIntoApp(ContentParent* aOpener,
                                             const nsAString& aAppManifestURL)
 {
     MOZ_ASSERT(IsPreallocated());
+    mMetamorphosed = true;
     mOpener = aOpener;
     mAppManifestURL = aAppManifestURL;
     TryGetNameFromManifestURL(aAppManifestURL, mAppName);
@@ -1506,6 +1520,7 @@ void
 ContentParent::TransformPreallocatedIntoBrowser(ContentParent* aOpener)
 {
     // Reset mAppManifestURL, mIsForBrowser and mOSPrivileges for browser.
+    mMetamorphosed = true;
     mOpener = aOpener;
     mAppManifestURL.Truncate();
     mIsForBrowser = true;
@@ -2032,6 +2047,7 @@ ContentParent::InitializeMembers()
     mGeolocationWatchID = -1;
     mNumDestroyingTabs = 0;
     mIsAlive = true;
+    mMetamorphosed = false;
     mSendPermissionUpdates = false;
     mSendDataStoreInfos = false;
     mCalledClose = false;
@@ -2063,6 +2079,10 @@ ContentParent::ContentParent(mozIApplication* aApp,
     // Only the preallocated process uses Nuwa.
     MOZ_ASSERT_IF(aIsNuwaProcess, aIsForPreallocated);
 
+    if (!aIsNuwaProcess && !aIsForPreallocated) {
+        mMetamorphosed = true;
+    }
+
     // Insert ourselves into the global linked list of ContentParent objects.
     if (!sContentParents) {
         sContentParents = new LinkedList<ContentParent>();

dom/ipc/ContentParent.h

@@ -410,6 +410,11 @@ private:
 
     void Init();
 
+    // Some information could be sent to content very early, it
+    // should be send from this function. This function should only be
+    // called after the process has been transformed to app or browser.
+    void ForwardKnownInfo();
+
     // If the frame element indicates that the child process is "critical" and
     // has a pending system message, this function acquires the CPU wake lock on
     // behalf of the child.  We'll release the lock when the system message is
@@ -812,6 +817,10 @@ private:
     // through.
     bool mIsAlive;
 
+    // True only the if process is already a browser or app or has
+    // been transformed into one.
+    bool mMetamorphosed;
+
     bool mSendPermissionUpdates;
     bool mSendDataStoreInfos;
     bool mIsForBrowser;