Fall back to heap allocation in courgette alloc.

courgette/memory_allocator.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COURGETTE_MEMORY_ALLOCATOR_H_
 #define COURGETTE_MEMORY_ALLOCATOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ skipping 219 matching lines @@
       TempMapping* mapping = UncheckedNew<TempMapping>();
       if (mapping) {
         if (mapping->Initialize(bytes)) {
           mem = reinterpret_cast<uint8_t*>(mapping->memory());
           mem[0] = static_cast<uint8_t>(FILE_ALLOCATION);
         } else {
           UncheckedDelete(mapping);
         }
       }
     }
+    // If the above fails (e.g. because we are in a sandbox), just try the heap.
+    if (!mem && base::UncheckedMalloc(bytes, reinterpret_cast<void**>(&mem))) {
+      mem[0] = static_cast<uint8_t>(HEAP_ALLOCATION);
+    }
     return mem ? reinterpret_cast<pointer>(mem + sizeof(T)) : NULL;
   }
 
   pointer allocate(size_type count, const void* hint) {
     return allocate(count);
   }
 
   void construct(pointer ptr, const T& value) {
     ::new(ptr) T(value);
   }
@@ skipping 248 matching lines @@
  protected:
   T* buffer_;
   size_t size_;  // how much of the buffer we're using.
   size_t alloc_size_;  // how much space we have allocated.
   Allocator alloc_;
 };
 
 }  // namespace courgette
 
 #endif  // COURGETTE_MEMORY_ALLOCATOR_H_