Allow apps with background pages to request process-per-app-instance.

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index c369d833e28a812d9c748b2ec6758931d071e071..634f541e43661548c8a1c8654ef5a7e5af8f7589 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -17,10 +17,11 @@ namespace extension_manifest_keys {
   extern const char kAltKey[];
   extern const char kApp[];
   extern const char kBackground[];
+  extern const char kBackgroundAllowJsAccess[];
   extern const char kBackgroundPage[];
   extern const char kBackgroundPageLegacy[];
-  extern const char kBackgroundScripts[];
   extern const char kBackgroundPersistent[];
+  extern const char kBackgroundScripts[];
   extern const char kBrowserAction[];
   extern const char kBrowseURLs[];
   extern const char kChromeURLOverrides[];
@@ -158,6 +159,8 @@ namespace extension_manifest_errors {
   extern const char kFeatureNotAllowed[];
   extern const char kInvalidAllFrames[];
   extern const char kInvalidBackground[];
+  extern const char kInvalidBackgroundAllowJsAccess[];
+  extern const char kInvalidBackgroundAllowJsAccessNoPage[];
   extern const char kInvalidBackgroundCombination[];
   extern const char kInvalidBackgroundScript[];
   extern const char kInvalidBackgroundScripts[];