Roll Chrome into Mojo.

gin/isolate_holder.cc

Index: gin/isolate_holder.cc
diff --git a/gin/isolate_holder.cc b/gin/isolate_holder.cc
index c666e29950a0a652a4085880fb716b86a07e4f75..21598a878ea465da1cc2985e728c0b93e42bf63e 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -10,6 +10,7 @@
 #include "base/files/memory_mapped_file.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
+#include "base/metrics/field_trial.h"
 #include "base/rand_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/sys_info.h"
@@ -266,8 +267,12 @@ void IsolateHolder::Initialize(ScriptMode mode,
   v8::V8::SetArrayBufferAllocator(allocator);
   g_array_buffer_allocator = allocator;
   if (mode == gin::IsolateHolder::kStrictMode) {
-    static const char v8_flags[] = "--use_strict";
-    v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
+    static const char use_strict[] = "--use_strict";
+    v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);
+  }
+  if (base::FieldTrialList::FindFullName("V8VerifyHeap") == "Enabled") {
+    static const char verify_heap[] = "--verify_heap";
+    v8::V8::SetFlagsFromString(verify_heap, sizeof(verify_heap) - 1);
   }
   v8::V8::SetEntropySource(&GenerateEntropy);
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)