Correctly record WebAPK install source for Launch.HomescreenSource

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
index c8dae5ee46e1273bc391671faffb611ca713418c..623d4840aec0272921904b3d51685d9af6b861d8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappDataStorage.java
@@ -340,6 +340,16 @@ public class WebappDataStorage {
         return mPreferences.getString(KEY_URL, URL_INVALID);
     }
 
+    /** Returns the source stored in this object, or the given default value if it is not stored. */
+    public int getSource(int defaultSource) {
+        return mPreferences.getInt(KEY_SOURCE, defaultSource);
+    }
+
+    /** Updates the source. */
+    public void updateSource(int source) {
+        mPreferences.edit().putInt(KEY_SOURCE, source).apply();
+    }
+
     /**
      * Returns the last used time of this object, or -1 if it is not stored.
      */