Prepare declarativeContent API for new script injection feature. Added Javascript types and functio…

chrome/browser/extensions/api/declarative_content/content_constants.cc

Index: chrome/browser/extensions/api/declarative_content/content_constants.cc
diff --git a/chrome/browser/extensions/api/declarative_content/content_constants.cc b/chrome/browser/extensions/api/declarative_content/content_constants.cc
index dda4f93bcbb323dacd06f0573c21ca4d490cbf64..beff6ec64b931342937d6d672ebf31bf78fe7b6b 100644
--- a/chrome/browser/extensions/api/declarative_content/content_constants.cc
+++ b/chrome/browser/extensions/api/declarative_content/content_constants.cc
@@ -9,6 +9,9 @@ namespace declarative_content_constants {
 
 // Signals to which ContentRulesRegistries are registered.
 const char kOnPageChanged[] = "declarativeContent.onPageChanged";
+const char kOnDocumentStart[] = "declarativeContent.onDocumentStart";
+const char kOnDocumentEnd[] = "declarativeContent.onDocumentEnd";
+const char kOnDocumentIdle[] = "declarativeContent.onDocumentIdle";
 
 // Keys of dictionaries.
 const char kCss[] = "css";
@@ -18,6 +21,7 @@ const char kPageUrl[] = "pageUrl";
 // Values of dictionaries, in particular instance types
 const char kPageStateMatcherType[] = "declarativeContent.PageStateMatcher";
 const char kShowPageAction[] = "declarativeContent.ShowPageAction";
+const char kRequestContentScript[] = "declarativeContent.RequestContentScript";
 
 }  // namespace declarative_content_constants
 }  // namespace extensions