Update from https://crrev.com/306655

gin/isolate_holder.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/public/isolate_holder.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "base/files/memory_mapped_file.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/rand_util.h"
 #include "base/sys_info.h"
 #include "gin/array_buffer.h"
 #include "gin/debug_impl.h"
 #include "gin/function_template.h"
 #include "gin/per_isolate_data.h"
 #include "gin/public/v8_platform.h"
 #include "gin/run_microtasks_observer.h"
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#ifdef OS_MACOSX
+#include "base/mac/foundation_util.h"
+#endif  // OS_MACOSX
 #include "base/path_service.h"
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
 namespace gin {
 
 namespace {
 
 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
 
 bool GenerateEntropy(unsigned char* buffer, size_t amount) {
@@ skipping 28 matching lines @@
         : !g_mapped_snapshot->Initialize(base::File(snapshot_fd))) {
       delete g_mapped_snapshot;
       g_mapped_snapshot = NULL;
       LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
       return false;
     }
   }
 
   return true;
 }
+
+#if !defined(OS_MACOSX)
+const int v8_snapshot_dir =
+#if defined(OS_ANDROID)
+    base::DIR_ANDROID_APP_DATA;
+#elif defined(OS_POSIX)
+    base::DIR_EXE;
+#endif  // defined(OS_ANDROID)
+#endif  // !defined(OS_MACOSX)
+
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
 }  // namespace
 
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 // static
 bool IsolateHolder::LoadV8Snapshot() {
   if (g_mapped_natives && g_mapped_snapshot)
     return true;
 
+#if !defined(OS_MACOSX)
   base::FilePath data_path;
-  PathService::Get(
-#if defined(OS_ANDROID)
-    base::DIR_ANDROID_APP_DATA,
-#elif defined(OS_POSIX)
-    base::DIR_EXE,
-#endif
-    &data_path);
+  PathService::Get(v8_snapshot_dir, &data_path);
   DCHECK(!data_path.empty());
 
   base::FilePath natives_path = data_path.AppendASCII("natives_blob.bin");
   base::FilePath snapshot_path = data_path.AppendASCII("snapshot_blob.bin");
+#else  // !defined(OS_MACOSX)
+  base::FilePath natives_path = base::mac::PathForFrameworkBundleResource(
+      CFSTR("natives_blob.bin"));
+  base::FilePath snapshot_path = base::mac::PathForFrameworkBundleResource(
+      CFSTR("snapshot_blob.bin"));
+  DCHECK(!natives_path.empty());
+  DCHECK(!snapshot_path.empty());
+#endif  // !defined(OS_MACOSX)
 
   return MapV8Files(&natives_path, &snapshot_path);
 }
 
 //static
 bool IsolateHolder::LoadV8SnapshotFD(int natives_fd, int snapshot_fd) {
   if (g_mapped_natives && g_mapped_snapshot)
     return true;
 
   return MapV8Files(NULL, NULL, natives_fd, snapshot_fd);
@@ skipping 70 matching lines @@
   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);
   }
   v8::V8::SetEntropySource(&GenerateEntropy);
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   v8::StartupData natives;
   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
   natives.raw_size = static_cast<int>(g_mapped_natives->length());
-  natives.compressed_size = static_cast<int>(g_mapped_natives->length());
   v8::V8::SetNativesDataBlob(&natives);
 
   v8::StartupData snapshot;
   snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
   snapshot.raw_size = static_cast<int>(g_mapped_snapshot->length());
-  snapshot.compressed_size = static_cast<int>(g_mapped_snapshot->length());
   v8::V8::SetSnapshotDataBlob(&snapshot);
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
   v8::V8::Initialize();
   v8_is_initialized = true;
 }
 
 void IsolateHolder::AddRunMicrotasksObserver() {
   DCHECK(!task_observer_.get());
   task_observer_.reset(new RunMicrotasksObserver(isolate_));;
   base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
 }
 
 void IsolateHolder::RemoveRunMicrotasksObserver() {
   DCHECK(task_observer_.get());
   base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
   task_observer_.reset();
 }
 
 }  // namespace gin