Add LowMemoryNotification to the API on Android platform....

src/mark-compact.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 57 matching lines @@
   // next live object in the same page.  For spaces using a different
   // encoding (ie, contiguous spaces), the offset parameter is ignored.
   typedef void (*EncodingFunction)(HeapObject* old_object,
                                    int object_size,
                                    Object* new_object,
                                    int* offset);
 
   // Type of functions to process non-live objects.
   typedef void (*ProcessNonLiveFunction)(HeapObject* object);
 
+  // Set the global force_compaction flag, it must be called before Prepare
+  // to take effect.
+  static void SetForceCompaction(bool value) {
+    force_compaction_ = value;
+  }
+
   // Prepares for GC by resetting relocation info in old and map spaces and
   // choosing spaces to compact.
   static void Prepare(GCTracer* tracer);
 
   // Performs a global garbage collection.
   static void CollectGarbage();
 
   // True if the last full GC performed heap compaction.
   static bool HasCompacted() { return compacting_collection_; }
 
@@ skipping 22 matching lines @@
     SWEEP_SPACES,
     ENCODE_FORWARDING_ADDRESSES,
     UPDATE_POINTERS,
     RELOCATE_OBJECTS,
     REBUILD_RSETS
   };
 
   // The current stage of the collector.
   static CollectorState state_;
 #endif
+
+  // Global flag that forces a compaction.
+  static bool force_compaction_;
+
   // Global flag indicating whether spaces were compacted on the last GC.
   static bool compacting_collection_;
 
   // The number of objects left marked at the end of the last completed full
   // GC (expected to be zero).
   static int previous_marked_count_;
 
   // A pointer to the current stack-allocated GC tracer object during a full
   // collection (NULL before and after).
   static GCTracer* tracer_;
@@ skipping 282 matching lines @@
 
   friend class UnmarkObjectVisitor;
   static void UnmarkObject(HeapObject* obj);
 #endif
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_