Push bleeding_edge revision 1556 to trunk.  Contains a minor API change.

git-svn-id: http://v8.googlecode.com/svn/trunk@1564 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/include/v8.h b/include/v8.h
index ab886cd..ac772cf 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -736,6 +736,11 @@
   int WriteUtf8(char* buffer, int length = -1) const; // UTF-8
 
   /**
+   * A zero length string.
+   */
+  static v8::Local<v8::String> Empty();
+
+  /**
    * Returns true if the string is external
    */
   bool IsExternal() const;
diff --git a/src/api.cc b/src/api.cc
index 785aa20..c4049a8 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2282,7 +2282,7 @@
 
 
 const char* v8::V8::GetVersion() {
-  return "1.1.1.3";
+  return "1.1.1.4";
 }
 
 
@@ -2474,9 +2474,17 @@
 }
 
 
+Local<String> v8::String::Empty() {
+  EnsureInitialized("v8::String::Empty()");
+  LOG_API("String::Empty()");
+  return Utils::ToLocal(i::Factory::empty_symbol());
+}
+
+
 Local<String> v8::String::New(const char* data, int length) {
   EnsureInitialized("v8::String::New()");
   LOG_API("String::New(char)");
+  if (length == 0) return Empty();
   if (length == -1) length = strlen(data);
   i::Handle<i::String> result =
       i::Factory::NewStringFromUtf8(i::Vector<const char>(data, length));
@@ -2505,6 +2513,7 @@
 Local<String> v8::String::New(const uint16_t* data, int length) {
   EnsureInitialized("v8::String::New()");
   LOG_API("String::New(uint16_)");
+  if (length == 0) return Empty();
   if (length == -1) length = TwoByteStringLength(data);
   i::Handle<i::String> result =
       i::Factory::NewStringFromTwoByte(i::Vector<const uint16_t>(data, length));