Enable context dropping on stopped only

Fixes: 245565051
Test: open calculator, hit home, wait 10s, dumpsys & verify no GL
context

Change-Id: I34566a566829c00c983ed6da78f71d8a8238c337
diff --git a/libs/hwui/MemoryPolicy.h b/libs/hwui/MemoryPolicy.h
index 41ced8c..2f0f7f5 100644
--- a/libs/hwui/MemoryPolicy.h
+++ b/libs/hwui/MemoryPolicy.h
@@ -53,8 +53,8 @@
     // Whether or not to only purge scratch resources when triggering UI Hidden or background
     // collection
     bool purgeScratchOnly = true;
-    // EXPERIMENTAL: Whether or not to trigger releasing GPU context when all contexts are stopped
-    bool releaseContextOnStoppedOnly = false;
+    // Whether or not to trigger releasing GPU context when all contexts are stopped
+    bool releaseContextOnStoppedOnly = true;
 };
 
 const MemoryPolicy& loadMemoryPolicy();