Fuchsia: Make fuchsia_test use snapshots

runtime/bin/fuchsia_test.cc

 // Copyright (c) 2016, 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 <dart_api.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/log.h"
 #include "platform/assert.h"
 
 const char* kBuiltinScript =
     "_printString(String line) native \"Builtin_PrintString\";\n"
     "_getPrintClosure() => _printString;\n";
 
 const char* kHelloWorldScript = "main() { print(\"Hello, Fuchsia!\"); }";
 
 namespace dart {
 namespace bin {
 
+// vm_isolate_snapshot_buffer points to a snapshot for the vm isolate if we
+// link in a snapshot otherwise it is initialized to NULL.
+extern const uint8_t* vm_isolate_snapshot_buffer;
+
+// isolate_snapshot_buffer points to a snapshot for an isolate if we link in a
+// snapshot otherwise it is initialized to NULL.
+extern const uint8_t* isolate_snapshot_buffer;
+
 static void Builtin_PrintString(Dart_NativeArguments args) {
   intptr_t length = 0;
   uint8_t* chars = NULL;
   Dart_Handle str = Dart_GetNativeArgument(args, 0);
   Dart_Handle result = Dart_StringToUTF8(str, &chars, &length);
   if (Dart_IsError(result)) {
     Dart_PropagateError(result);
   }
   // Uses fwrite to support printing NUL bytes.
   intptr_t res = fwrite(chars, 1, length, stdout);
@@ skipping 100 matching lines @@
   DART_CHECK_VALID(status);
 }
 
 int Main() {
   Log::Print("Calling Dart_SetVMFlags\n");
   if (!Dart_SetVMFlags(0, NULL)) {
     FATAL("Failed to set flags\n");
   }
   Log::Print("Calling Dart_Initialize\n");
   char* error = Dart_Initialize(
-      NULL, NULL, NULL,
+      vm_isolate_snapshot_buffer, NULL, NULL,
       NULL, NULL, NULL, NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL);
   if (error != NULL) {
     FATAL1("VM initialization failed: %s\n", error);
   }
 
   Log::Print("Creating Isolate\n");
   Dart_Isolate isolate = Dart_CreateIsolate(
       "script_uri",
       "main",
-      NULL,
+      isolate_snapshot_buffer,
       NULL,
       NULL,
       &error);
   if (isolate == NULL) {
     FATAL1("Dart_CreateIsolate failed: %s\n", error);
   }
 
   Log::Print("Entering Scope\n");
   Dart_EnterScope();
 
@@ skipping 32 matching lines @@
   Log::Print("Success!\n");
   return 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(void) {
   return dart::bin::Main();
 }