Minimize malloc heap allocation on process startup.

test/cctest/test-debug.cc

 // Copyright 2011 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 5826 matching lines @@
 
   debug_message_dispatch_v8_thread.Start();
   debug_message_dispatch_debugger_thread.Start();
 
   debug_message_dispatch_v8_thread.Join();
   debug_message_dispatch_debugger_thread.Join();
 }
 
 
 TEST(DebuggerAgent) {
+  v8::V8::Initialize();
   i::Debugger* debugger = i::Isolate::Current()->debugger();
   // Make sure these ports is not used by other tests to allow tests to run in
   // parallel.
   const int kPort1 = 5858;
   const int kPort2 = 5857;
   const int kPort3 = 5856;
 
   // Make a string with the port2 number.
   const int kPortBufferLen = 6;
   char port2_str[kPortBufferLen];
@@ skipping 1437 matching lines @@
   TestDebugBreakInLoop("for (;;) {", loop_bodies, "}");
   TestDebugBreakInLoop("for (;a == 1;) {", loop_bodies, "}");
 
   // Get rid of the debug event listener.
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
 }
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT