Split content script injections into multiple tasks

extensions/renderer/script_injection.h

Index: extensions/renderer/script_injection.h
diff --git a/extensions/renderer/script_injection.h b/extensions/renderer/script_injection.h
index e5cd8ac5434061c83b503d75e8af5122ce9df21f..8d57dd4c8812484d43d632bb01f9cc23ced0587e 100644
--- a/extensions/renderer/script_injection.h
+++ b/extensions/renderer/script_injection.h
@@ -84,6 +84,10 @@ class ScriptInjection {
   const HostID& host_id() const { return injection_host_->id(); }
   int64_t request_id() const { return request_id_; }
 
+  // Called when JS injection for the given frame has been completed.
+  void OnJsInjectionCompleted(const std::vector<v8::Local<v8::Value>>& results,
+                              base::TimeDelta elapsed);
+
  private:
   class FrameWatcher;
 
@@ -98,9 +102,6 @@ class ScriptInjection {
   void InjectJs(std::set<std::string>* executing_scripts,
                 size_t* num_injected_js_scripts);
 
-  // Called when JS injection for the given frame has been completed.
-  void OnJsInjectionCompleted(const std::vector<v8::Local<v8::Value>>& results);
-
   // Inject any CSS source into the frame for the injection.
   void InjectCss(std::set<std::string>* injected_stylesheets,
                  size_t* num_injected_stylesheets);