[snapshot] revisit snapshot API.

test/cctest/heap/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4811 matching lines @@
   if (i::FLAG_always_opt || !i::FLAG_crankshaft) return;
   if (!i::FLAG_incremental_marking) return;
   i::FLAG_weak_embedded_objects_in_optimized_code = true;
   i::FLAG_allow_natives_syntax = true;
   i::FLAG_compilation_cache = false;
   i::FLAG_retain_maps_for_n_gc = 0;
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
 
   // Do not run for no-snap builds.
-  if (!i::Snapshot::HaveASnapshotToStartFrom(isolate)) return;
+  if (!i::Snapshot::HasContextSnapshot(isolate, 0)) return;
 
   v8::internal::Heap* heap = CcTest::heap();
 
   // Get a clean slate regarding optimized functions on the heap.
   i::Deoptimizer::DeoptimizeAll(isolate);
   heap->CollectAllGarbage();
 
   if (!isolate->use_crankshaft()) return;
   HandleScope outer_scope(heap->isolate());
   for (int i = 0; i < 3; i++) {
@@ skipping 1118 matching lines @@
 
 
 TEST(BootstrappingExports) {
   // Expose utils object and delete it to observe that it is indeed
   // being garbage-collected.
   FLAG_expose_natives_as = "utils";
   CcTest::InitializeVM();
   v8::Isolate* isolate = CcTest::isolate();
   LocalContext env;
 
-  if (Snapshot::HaveASnapshotToStartFrom(CcTest::i_isolate())) return;
+  if (Snapshot::HasContextSnapshot(CcTest::i_isolate(), 0)) return;
 
   utils_has_been_collected = false;
 
   v8::Persistent<v8::Object> utils;
 
   {
     v8::HandleScope scope(isolate);
     v8::Local<v8::String> name = v8_str("utils");
     utils.Reset(isolate, CcTest::global()
                              ->Get(env.local(), name)
@@ skipping 743 matching lines @@
   int mark_sweeps_performed = mark_sweep_count_after - mark_sweep_count_before;
   // The memory pressuer handler either performed two GCs or performed one and
   // started incremental marking.
   CHECK(mark_sweeps_performed == 2 ||
         (mark_sweeps_performed == 1 &&
          !heap->incremental_marking()->IsStopped()));
 }
 
 }  // namespace internal
 }  // namespace v8