Add OfficeIPCThread::WaitForReady.

For LibreOfficeKit we need to start up the event loop, and can't continue
initialisation until all the related (VCL etc.) setup is complete -- the
OfficeIPCThread is also enabled as one of the last items, and can be
used to indicate whether or not we can start actually working with VCL.

Change-Id: I0450b65584ddf6e8d02ce0c6e66e06f47841d1b7

desktop/source/app/officeipcthread.cxx

@@ -670,6 +670,18 @@ void OfficeIPCThread::SetReady(
     }
 }
 
+void OfficeIPCThread::WaitForReady(
+    rtl::Reference< OfficeIPCThread > const & pThread)
+
+{
+    rtl::Reference< OfficeIPCThread > const & t(
+        pThread.is() ? pThread : pGlobalOfficeIPCThread);
+    if (t.is())
+    {
+        t->cReady.wait();
+    }
+}
+
 void OfficeIPCThread::execute()
 {
 #if HAVE_FEATURE_DESKTOP

desktop/source/app/officeipcthread.hxx

@@ -126,6 +126,9 @@ class OfficeIPCThread : public salhelper::Thread
     static void                 SetReady(
         rtl::Reference< OfficeIPCThread > const & pThread =
             rtl::Reference< OfficeIPCThread >());
+    static void                 WaitForReady(
+        rtl::Reference< OfficeIPCThread > const & pThread =
+            rtl::Reference< OfficeIPCThread >());
 
     bool                        AreRequestsEnabled() const { return mbRequestsEnabled && ! mbDowning; }
 };