Don't use IPC in isolateProcess

Fixes: 74395652
Test: hwuiunit passes in 'shell stop' state (pseudo-isolated process),
      manually checked non-isolated processes still have working vsync
      via systrace of RT animations demo

Change-Id: I630ea011dc7eb2efa265b25673d3304b3b2510d3
diff --git a/libs/hwui/tests/unit/main.cpp b/libs/hwui/tests/unit/main.cpp
index 406255d..9e6d9a8 100644
--- a/libs/hwui/tests/unit/main.cpp
+++ b/libs/hwui/tests/unit/main.cpp
@@ -21,6 +21,7 @@
 #include "debug/GlesDriver.h"
 #include "debug/NullGlesDriver.h"
 #include "hwui/Typeface.h"
+#include "Properties.h"
 #include "tests/common/LeakChecker.h"
 #include "thread/TaskManager.h"
 
@@ -67,6 +68,7 @@
 
     // Replace the default GLES driver
     debug::GlesDriver::replace(std::make_unique<debug::NullGlesDriver>());
+    Properties::isolatedProcess = true;
 
     // Run the tests
     testing::InitGoogleTest(&argc, argv);