Correctly record WebAPK install source for Launch.HomescreenSource

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
index 254a3c01086eced6705b77be521e2dcd7a7b0e6d..1a054cf089017db7956d2162c9c1365bb8f75501 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
@@ -79,7 +79,11 @@ public class WebappLauncherActivity extends Activity {
         // - the intent was sent by Chrome.
         if (validWebApk || isValidMacForUrl(webappUrl, webappMac)
                 || wasIntentFromChrome(intent)) {
-            LaunchMetrics.recordHomeScreenLaunchIntoStandaloneActivity(webappUrl, webappSource);
+            if (!validWebApk) {
+                // We record the launch metrics for WebAPKs in the WebApkActivity. This is because
+                // we can only get the source info from WebappDataStorage, not in the APK.
+                LaunchMetrics.recordHomeScreenLaunchIntoStandaloneActivity(webappUrl, webappSource);
+            }
             Intent launchIntent = createWebappLaunchIntent(webappInfo, webappSource, validWebApk);
             startActivity(launchIntent);
             return;