Forward accessibility events to the automation extension process.

extensions/browser/extension_function.h

Index: extensions/browser/extension_function.h
diff --git a/extensions/browser/extension_function.h b/extensions/browser/extension_function.h
index 3f6f9cecb7e892e6013e010e324536c3f18fc26c..23ffedf5ad96607a70270dc92442d125a41d7291 100644
--- a/extensions/browser/extension_function.h
+++ b/extensions/browser/extension_function.h
@@ -278,6 +278,13 @@ class ExtensionFunction
     return source_context_type_;
   }
 
+  void set_source_process_id(int source_process_id) {
+    source_process_id_ = source_process_id;
+  }
+  int source_process_id() const {
+    return source_process_id_;
+  }
+
  protected:
   friend struct ExtensionFunctionDeleteTraits;
 
@@ -424,6 +431,10 @@ class ExtensionFunction
   // The type of the JavaScript context where this call originated.
   extensions::Feature::Context source_context_type_;
 
+  // The process ID of the page that triggered this function call, or -1
+  // if unknown.
+  int source_process_id_;
+
  private:
   void OnRespondingLater(ResponseValue response);