Improve Transition GC initiation by removing the 5s delay

Once an app transitions to cached state and the runtime is updated, a
transition GC should immediately be requested without the 5s delay.
This allows the GC to execute before the app gets frozen and removes the
not needed 5s delay.

Test: Local testing
Bug: 272381448
Change-Id: I5197c1367c4c4c841af6de666e94276fcba0d85c
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index 99b0c11..3b7f0e8 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -1102,15 +1102,11 @@
       RequestCollectorTransition(foreground_collector_type_, 0);
       GrowHeapOnJankPerceptibleSwitch();
     } else {
-      // Don't delay for debug builds since we may want to stress test the GC.
       // If background_collector_type_ is kCollectorTypeHomogeneousSpaceCompact then we have
       // special handling which does a homogenous space compaction once but then doesn't transition
       // the collector. Similarly, we invoke a full compaction for kCollectorTypeCC but don't
       // transition the collector.
-      RequestCollectorTransition(background_collector_type_,
-                                 kStressCollectorTransition
-                                     ? 0
-                                     : kCollectorTransitionWait);
+      RequestCollectorTransition(background_collector_type_, 0);
     }
   }
 }
diff --git a/runtime/gc/heap.h b/runtime/gc/heap.h
index 977c632..31a1b2b 100644
--- a/runtime/gc/heap.h
+++ b/runtime/gc/heap.h
@@ -182,10 +182,8 @@
 
   // How often we allow heap trimming to happen (nanoseconds).
   static constexpr uint64_t kHeapTrimWait = MsToNs(5000);
-  // How long we wait after a transition request to perform a collector transition (nanoseconds).
-  static constexpr uint64_t kCollectorTransitionWait = MsToNs(5000);
-  // Whether the transition-wait applies or not. Zero wait will stress the
-  // transition code and collector, but increases jank probability.
+  // Whether the transition-GC heap threshold condition applies or not for non-low memory devices.
+  // Stressing GC will bypass the heap threshold condition.
   DECLARE_RUNTIME_DEBUG_FLAG(kStressCollectorTransition);
 
   // Create a heap with the requested sizes. The possible empty