Synchronize with r15701.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 55059015b19113e71a1859902c28c5f88e3780f7..9ce05831b484c86c6cdc478ae8af2b1c5e0d5681 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4699,6 +4699,12 @@ class V8EXPORT V8 {
    */
   static int ContextDisposedNotification();
 
+  /**
+   * Initialize the ICU library bundled with V8. The embedder should only
+   * invoke this method when using the bundled ICU. Returns true on success.
+   */
+  static bool InitializeICU();
+
  private:
   V8();
 
@@ -5393,7 +5399,7 @@ class Internals {
   static const int kNullValueRootIndex = 7;
   static const int kTrueValueRootIndex = 8;
   static const int kFalseValueRootIndex = 9;
-  static const int kEmptyStringRootIndex = 131;
+  static const int kEmptyStringRootIndex = 132;
 
   static const int kNodeClassIdOffset = 1 * kApiPointerSize;
   static const int kNodeFlagsOffset = 1 * kApiPointerSize + 3;