[debug,api] Do not use embedder field for debug context id.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index ae84f389ab16f426d493fb74d18acc7c715588ca..54e1b675a415b308520202bd9bf8ad37b932f731 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -8298,16 +8298,8 @@ class V8_EXPORT Context {
   Isolate* GetIsolate();
 
   /**
-   * The field at kDebugIdIndex is reserved for V8 debugger implementation.
-   * The value is propagated to the scripts compiled in given Context and
-   * can be used for filtering scripts.
-   */
-  enum EmbedderDataFields { kDebugIdIndex = 0 };

[jochen (gone - plz use gerrit), 2017/04/10 12:50:34]

this won't work unless you first clean up blink 

-
-  /**
    * Gets the embedder data with the given index, which must have been set by a
-   * previous call to SetEmbedderData with the same index. Note that index 0
-   * currently has a special meaning for Chrome's debugger.
+   * previous call to SetEmbedderData with the same index.
    */
   V8_INLINE Local<Value> GetEmbedderData(int index);