Do not allocate a buffer of 64KB by default when writing a message out. Start

vm/snapshot_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_message.h"
@@ skipping 645 matching lines @@
   Dart_CObject* root = api_reader.ReadMessage();
   EXPECT_EQ(Dart_CObject::kUint8Array, root->type);
   EXPECT_EQ(kByteArrayLength, root->value.as_byte_array.length);
   EXPECT(root->value.as_byte_array.values == NULL);
   CheckEncodeDecodeMessage(root);
 }
 
 
 class TestSnapshotWriter : public SnapshotWriter {
  public:
+  static const intptr_t kIncrementSize = 64 * KB;
   TestSnapshotWriter(uint8_t** buffer, ReAlloc alloc)
-      : SnapshotWriter(Snapshot::kScript, buffer, alloc) {
+      : SnapshotWriter(Snapshot::kScript, buffer, alloc, kIncrementSize) {
     ASSERT(buffer != NULL);
     ASSERT(alloc != NULL);
   }
   ~TestSnapshotWriter() { }
 
   // Writes just a script object
   void WriteScript(const Script& script) {
     WriteObject(script.raw());
     UnmarkAll();
   }
@@ skipping 899 matching lines @@
   EXPECT(Dart_ErrorHasException(result));
   EXPECT_SUBSTRING("Exception: nulltruefalse1234563.14[]100123456789\n",
                    Dart_GetError(result));
 
   Dart_ExitScope();
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart