Bug 1366711 - Make it possible to hide applications launched with nsIProcess; r=bsmedberg

MozReview-Commit-ID: K3vadzPg8SR

--HG--
extra : rebase_source : 9803bdca46c7dceb9bae0eefa4972369c7b36202

xpcom/threads/nsIProcess.idl

@@ -74,6 +74,13 @@ interface nsIProcess : nsISupports
 		 in unsigned long count,
 		 [optional] in nsIObserver observer, [optional] in boolean holdWeak);
 
+  /**
+   * When set to true the process will not open a new window when started and
+   * will run hidden from the user. This currently affects only the Windows
+   * platform.
+   */
+  attribute boolean startHidden;
+
   /**
    * The process identifier of the currently running process. This will only
    * be available after the process has started and may not be available on

xpcom/threads/nsProcess.h

@@ -62,6 +62,7 @@ private:
   mozilla::Mutex mLock;
   bool mShutdown;
   bool mBlocking;
+  bool mStartHidden;
 
   nsCOMPtr<nsIFile> mExecutable;
   nsString mTargetPath;

xpcom/threads/nsProcessCommon.cpp

@@ -72,6 +72,7 @@ nsProcess::nsProcess()
   , mLock("nsProcess.mLock")
   , mShutdown(false)
   , mBlocking(false)
+  , mStartHidden(false)
   , mPid(-1)
   , mObserver(nullptr)
   , mWeakObserver(nullptr)
@@ -487,7 +488,7 @@ nsProcess::RunProcess(bool aBlocking, char** aMyArgv, nsIObserver* aObserver,
   sinfo.cbSize = sizeof(SHELLEXECUTEINFOW);
   sinfo.hwnd   = nullptr;
   sinfo.lpFile = wideFile.get();
-  sinfo.nShow  = SW_SHOWNORMAL;
+  sinfo.nShow  = mStartHidden ? SW_HIDE : SW_SHOWNORMAL;
   sinfo.fMask  = SEE_MASK_FLAG_DDEWAIT |
                  SEE_MASK_NO_CONSOLE |
                  SEE_MASK_NOCLOSEPROCESS;
@@ -588,6 +589,20 @@ nsProcess::GetIsRunning(bool* aIsRunning)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsProcess::GetStartHidden(bool* aStartHidden)
+{
+  *aStartHidden = mStartHidden;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsProcess::SetStartHidden(bool aStartHidden)
+{
+  mStartHidden = aStartHidden;
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsProcess::GetPid(uint32_t* aPid)
 {