Add memory pressure interrupt for memory pressure notification

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 935 matching lines @@
       if (api_interrupts_queue_.empty()) return;
       entry = api_interrupts_queue_.front();
       api_interrupts_queue_.pop();
     }
     VMState<EXTERNAL> state(this);
     HandleScope handle_scope(this);
     entry.first(reinterpret_cast<v8::Isolate*>(this), entry.second);
   }
 }
 
+void Isolate::RequestMemoryPressureInterrupt(
+    v8::Isolate::MemoryPressureLevel level) {
+  ExecutionAccess access(this);
+  memory_pressure_level_ = level;
+  stack_guard()->RequestMemoryPressureInterrupt();
+}
 
 void ReportBootstrappingException(Handle<Object> exception,
                                   MessageLocation* location) {
   base::OS::PrintError("Exception thrown during bootstrapping\n");
   if (location == NULL || location->script().is_null()) return;
   // We are bootstrapping and caught an error where the location is set
   // and we have a script for the location.
   // In this case we could have an extension (or an internal error
   // somewhere) and we print out the line number at which the error occured
   // to the console for easier debugging.
@@ skipping 2009 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8