Add counter for new shared/array buffers that fail to allocate space.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 19467 matching lines @@
       isolate->counters()->array_buffer_big_allocations()->AddSample(
           sizeof(uint64_t) * kBitsPerByte -
           base::bits::CountLeadingZeros64(allocated_length));
     }
     if (initialize) {
       data = isolate->array_buffer_allocator()->Allocate(allocated_length);
     } else {
       data = isolate->array_buffer_allocator()->AllocateUninitialized(
           allocated_length);
     }
-    if (data == NULL) return false;
+    if (data == NULL) {
+      isolate->counters()->array_buffer_new_size_failures()->AddSample(
+          sizeof(uint64_t) * kBitsPerByte -
+          base::bits::CountLeadingZeros64(allocated_length));
+      return false;
+    }
   } else {
     data = NULL;
   }
 
   JSArrayBuffer::Setup(array_buffer, isolate, false, data, allocated_length,
                        shared);
   return true;
 }
 
 
@@ skipping 916 matching lines @@
       // depend on this.
       return DICTIONARY_ELEMENTS;
     }
     DCHECK_LE(kind, LAST_ELEMENTS_KIND);
     return kind;
   }
 }
 
 }  // namespace internal
 }  // namespace v8