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/DeviceInfo.h b/libs/hwui/DeviceInfo.h
index a0b2f06..297b266 100644
--- a/libs/hwui/DeviceInfo.h
+++ b/libs/hwui/DeviceInfo.h
@@ -47,12 +47,13 @@
         return di.w * di.h * in;
     }
 
+    static DisplayInfo queryDisplayInfo();
+
 private:
     DeviceInfo() {}
     ~DeviceInfo() {}
 
     void load();
-    void loadDisplayInfo();
 
     int mMaxTextureSize;
     DisplayInfo mDisplayInfo;