Limit size of first page based on serialized data.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index e80f4f1d06dd86cc00b194f4cd66161ce6be09bb..5136953c1dad2a0e212b1273a5aa0ed446543013 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -4993,3 +4993,20 @@ TEST(PathTracer) {
   CcTest::i_isolate()->heap()->TracePathToObject(*o);
 }
 #endif  // DEBUG
+
+
+TEST(FirstPageFitsStartup) {
+  // Test that the first page sizes provided by the default snapshot are large
+  // enough to fit everything right after startup and creating one context.
+  // If this test fails, we are allocating too much aside from deserialization.
+  if (!Snapshot::HaveASnapshotToStartFrom()) return;
+  if (Snapshot::EmbedsScript()) return;
+  CcTest::InitializeVM();
+  LocalContext env;
+  PagedSpaces spaces(CcTest::heap());
+  for (PagedSpace* s = spaces.next(); s != NULL; s = spaces.next()) {
+    int counter = 0;
+    for (PageIterator it(s); it.has_next(); it.next()) counter++;
+    CHECK_LE(counter, 1);
+  }
+}