Initialize V8 in PDFium from external files (plugin process only)

chrome/plugin/chrome_content_plugin_client.cc

Index: chrome/plugin/chrome_content_plugin_client.cc
diff --git a/chrome/plugin/chrome_content_plugin_client.cc b/chrome/plugin/chrome_content_plugin_client.cc
index 1abe0a3fd905db8aa19a7ab4f259f8f2c64dd706..87c20d03fc1f5f67b86ab77985c6db1e732137fd 100644
--- a/chrome/plugin/chrome_content_plugin_client.cc
+++ b/chrome/plugin/chrome_content_plugin_client.cc
@@ -17,9 +17,17 @@
 #endif
 #endif
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif
+
 namespace chrome {
 
 void ChromeContentPluginClient::PreSandboxInitialization() {
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
+
 #if defined(ENABLE_REMOTING)
 
   // Load crypto libraries for the Chromoting client plugin.