Bug 863515 - Expose hasContentOpener on nsITabParent. r=smaug.

hasContentOpener is set to true if a tab happened to be opened
due to content requesting it - for example, a target="_blank" link,
or a window.open.

--HG--
extra : rebase_source : f29e509d630b25bf7af91254adb7256c1537c800

dom/interfaces/base/nsITabParent.idl

@@ -5,7 +5,7 @@
 
 #include "domstubs.idl"
 
-[scriptable, uuid(b19038ba-0d75-40d2-be35-742e26d33bf9)]
+[scriptable, uuid(4d4576eb-ecfe-47b9-93b8-4121518621ad)]
 interface nsITabParent : nsISupports
 {
   void injectTouchEvent(in AString aType,
@@ -26,4 +26,6 @@ interface nsITabParent : nsISupports
   void setIsDocShellActive(in bool aIsActive);
 
   readonly attribute uint64_t tabId;
+
+  readonly attribute boolean hasContentOpener;
 };

dom/ipc/TabParent.cpp

@@ -284,6 +284,7 @@ TabParent::TabParent(nsIContentParent* aManager,
   , mNeedLayerTreeReadyNotification(false)
   , mCursor(nsCursor(-1))
   , mTabSetsCursor(false)
+  , mHasContentOpener(false)
 {
   MOZ_ASSERT(aManager);
 }
@@ -609,6 +610,11 @@ TabParent::RecvCreateWindow(PBrowserParent* aNewTab,
   NS_ENSURE_SUCCESS(rv, false);
 
   TabParent* newTab = TabParent::GetFrom(aNewTab);
+  MOZ_ASSERT(newTab);
+
+  // Content has requested that we open this new content window, so
+  // we must have an opener.
+  newTab->SetHasContentOpener(true);
 
   nsCOMPtr<nsIContent> frame(do_QueryInterface(mFrameElement));
 
@@ -2906,6 +2912,19 @@ TabParent::GetTabId(uint64_t* aId)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+TabParent::GetHasContentOpener(bool* aResult)
+{
+  *aResult = mHasContentOpener;
+  return NS_OK;
+}
+
+void
+TabParent::SetHasContentOpener(bool aHasContentOpener)
+{
+  mHasContentOpener = aHasContentOpener;
+}
+
 class LayerTreeUpdateRunnable final
   : public nsRunnable
 {

dom/ipc/TabParent.h

@@ -458,6 +458,8 @@ protected:
     bool InitBrowserConfiguration(const nsCString& aURI,
                                   BrowserConfiguration& aConfiguration);
 
+    void SetHasContentOpener(bool aHasContentOpener);
+
     // IME
     static TabParent *mIMETabParent;
     nsString mIMECacheText;
@@ -605,6 +607,7 @@ private:
 
     nsRefPtr<nsIPresShell> mPresShellWithRefreshListener;
 
+    bool mHasContentOpener;
 private:
     // This is used when APZ needs to find the TabParent associated with a layer
     // to dispatch events.