Infrastructure for reading V8's initial snapshot from external files

net/proxy/proxy_resolver_v8.cc

 // Copyright (c) 2012 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 "net/proxy/proxy_resolver_v8.h"
 
 #include <algorithm>
 #include <cstdio>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/lock.h"
 #include "gin/array_buffer.h"
 #include "gin/public/isolate_holder.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 #include "net/base/net_util.h"
 #include "net/proxy/proxy_info.h"
 #include "net/proxy/proxy_resolver_script.h"
 #include "url/gurl.h"
 #include "url/url_canon.h"
 #include "v8/include/v8.h"
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif
+
 // Notes on the javascript environment:
 //
 // For the majority of the PAC utility functions, we use the same code
 // as Firefox. See the javascript library that proxy_resolver_scipt.h
 // pulls in.
 //
 // In addition, we implement a subset of Microsoft's extensions to PAC.
 // - myIpAddressEx()
 // - dnsResolveEx()
 // - isResolvableEx()
@@ skipping 723 matching lines @@
   int rv = context->InitV8(script_data);
   if (rv == OK)
     context_.reset(context.release());
   return rv;
 }
 
 // static
 void ProxyResolverV8::EnsureIsolateCreated() {
   if (g_proxy_resolver_isolate_)
     return;
+
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
+
   gin::IsolateHolder::Initialize(gin::IsolateHolder::kNonStrictMode,
                                  gin::ArrayBufferAllocator::SharedInstance());
   g_proxy_resolver_isolate_ = new gin::IsolateHolder;
   ANNOTATE_LEAKING_OBJECT_PTR(g_proxy_resolver_isolate_);
 }
 
 // static
 v8::Isolate* ProxyResolverV8::GetDefaultIsolate() {
   DCHECK(g_proxy_resolver_isolate_)
       << "Must call ProxyResolverV8::EnsureIsolateCreated() first";
@@ skipping 20 matching lines @@
     return 0;
 
   v8::Locker locked(g_proxy_resolver_isolate_->isolate());
   v8::Isolate::Scope isolate_scope(g_proxy_resolver_isolate_->isolate());
   v8::HeapStatistics heap_statistics;
   g_proxy_resolver_isolate_->isolate()->GetHeapStatistics(&heap_statistics);
   return heap_statistics.used_heap_size();
 }
 
 }  // namespace net