Implement "appinstalled" event on Android.

chrome/browser/android/webapps/add_to_homescreen_manager.h

Index: chrome/browser/android/webapps/add_to_homescreen_manager.h
diff --git a/chrome/browser/android/webapps/add_to_homescreen_manager.h b/chrome/browser/android/webapps/add_to_homescreen_manager.h
index 1832771e6918ba0f683628780dc67f054b8171f7..155f05951bd2d6df2b66c268c333998e6bc0f6fb 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_manager.h
+++ b/chrome/browser/android/webapps/add_to_homescreen_manager.h
@@ -9,6 +9,7 @@
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h"
+#include "third_party/WebKit/public/platform/modules/installation/installation.mojom.h"
 
 namespace content {
 class WebContents;
@@ -77,6 +78,9 @@ class AddToHomescreenManager : public AddToHomescreenDataFetcher::Observer {
   // Fetches data required to add a shortcut.
   scoped_refptr<AddToHomescreenDataFetcher> data_fetcher_;
 
+  // Service to send events to the renderer.
+  blink::mojom::InstallationServicePtr installation_service_;
+
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenManager);
 };