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/Properties.cpp b/libs/hwui/Properties.cpp
index e9adbdc..1602b4b 100644
--- a/libs/hwui/Properties.cpp
+++ b/libs/hwui/Properties.cpp
@@ -63,6 +63,7 @@
 
 bool Properties::runningInEmulator = false;
 bool Properties::debuggingEnabled = false;
+bool Properties::isolatedProcess = false;
 
 static int property_get_int(const char* key, int defaultValue) {
     char buf[PROPERTY_VALUE_MAX] = {