Introduce internal Log class that handles writing log messages, enable logging to memory buffer.

src/api.cc

 // Copyright 2009 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 3094 matching lines @@
   i::Logger::PauseProfiler();
 #endif
 }
 
 void V8::ResumeProfiler() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   i::Logger::ResumeProfiler();
 #endif
 }
 
+int V8::GetLogLines(int from_pos, char* dest_buf, int max_size) {
+#ifdef ENABLE_LOGGING_AND_PROFILING
+  return i::Logger::GetLogLines(from_pos, dest_buf, max_size);
+#endif
+}
 
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj) {
   EnsureInitialized("v8::String::Utf8Value::Utf8Value()");
   if (obj.IsEmpty()) {
     str_ = NULL;
     length_ = 0;
     return;
   }
   ENTER_V8;
   HandleScope scope;
@@ skipping 328 matching lines @@
       reinterpret_cast<HandleScopeImplementer*>(storage);
   List<void**>* blocks_of_archived_thread = thread_local->Blocks();
   v8::ImplementationUtilities::HandleScopeData* handle_data_of_archived_thread =
       &thread_local->handle_scope_data_;
   Iterate(v, blocks_of_archived_thread, handle_data_of_archived_thread);
 
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal