Update V8 to r7427: Initial merge by git

As required by WebKit r82507

Change-Id: I7ae83ef3f689356043b4929255b7c1dd31d8c5df
diff --git a/src/mirror-debugger.js b/src/mirror-debugger.js
index 416f887..99e9819 100644
--- a/src/mirror-debugger.js
+++ b/src/mirror-debugger.js
@@ -170,14 +170,15 @@
 
 // A copy of the PropertyType enum from global.h
 PropertyType = {};
-PropertyType.Normal             = 0;
-PropertyType.Field              = 1;
-PropertyType.ConstantFunction   = 2;
-PropertyType.Callbacks          = 3;
-PropertyType.Interceptor        = 4;
-PropertyType.MapTransition      = 5;
-PropertyType.ConstantTransition = 6;
-PropertyType.NullDescriptor     = 7;
+PropertyType.Normal                  = 0;
+PropertyType.Field                   = 1;
+PropertyType.ConstantFunction        = 2;
+PropertyType.Callbacks               = 3;
+PropertyType.Interceptor             = 4;
+PropertyType.MapTransition           = 5;
+PropertyType.ExternalArrayTransition = 6;
+PropertyType.ConstantTransition      = 7;
+PropertyType.NullDescriptor          = 8;
 
 
 // Different attributes for a property.