Cleanup Tool WebUI: Add functionality to the Scan button

chrome/browser/ui/webui/cleanup_tool/cleanup_action_handler.h

Index: chrome/browser/ui/webui/cleanup_tool/cleanup_action_handler.h
diff --git a/chrome/browser/ui/webui/cleanup_tool/cleanup_action_handler.h b/chrome/browser/ui/webui/cleanup_tool/cleanup_action_handler.h
index 87ee24a3f401c0a0845a488fac7e22ad44326361..a30928764480f8cc69e2dc4b981b13a52d82615c 100644
--- a/chrome/browser/ui/webui/cleanup_tool/cleanup_action_handler.h
+++ b/chrome/browser/ui/webui/cleanup_tool/cleanup_action_handler.h
@@ -7,6 +7,7 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "components/component_updater/component_updater_service.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 // The handler for Javascript messages related to the "Chrome Cleanup" view.
@@ -20,6 +21,11 @@ class CleanupActionHandler : public content::WebUIMessageHandler {
 
  private:
   void HandleRequestLastScanResult(const base::ListValue* args);
+  void HandleStartScan(const base::ListValue* args);
+
+  // Returns the scan result initiated by HandleStartScan() to the Javascript
+  // caller refererenced by |callback_id|.
+  void ReportScanResults(const std::string& callback_id);
 
   DISALLOW_COPY_AND_ASSIGN(CleanupActionHandler);
 };