Fix: long-tapping a WebAPK in recents shows Chrome.

chrome/android/webapk/shell_apk/BUILD.gn

Index: chrome/android/webapk/shell_apk/BUILD.gn
diff --git a/chrome/android/webapk/shell_apk/BUILD.gn b/chrome/android/webapk/shell_apk/BUILD.gn
index b7527621ff609864a8cedad7f256658865c104d0..d901c1c335553479aa223e5fb4c3cce39dd7a8eb 100644
--- a/chrome/android/webapk/shell_apk/BUILD.gn
+++ b/chrome/android/webapk/shell_apk/BUILD.gn
@@ -111,7 +111,9 @@ android_library("webapk_java") {
     "src/org/chromium/webapk/shell_apk/DexLoader.java",
     "src/org/chromium/webapk/shell_apk/HostBrowserClassLoader.java",
     "src/org/chromium/webapk/shell_apk/MainActivity.java",
+    "src/org/chromium/webapk/shell_apk/LaunchWebApkHelper.java",
     "src/org/chromium/webapk/shell_apk/NotificationSettingsLauncherActivity.java",
+    "src/org/chromium/webapk/shell_apk/RecentsPlaceholderActivity.java",
     "src/org/chromium/webapk/shell_apk/WebApkSandboxedProcessService.java",
     "src/org/chromium/webapk/shell_apk/WebApkSandboxedProcessService0.java",
     "src/org/chromium/webapk/shell_apk/WebApkSandboxedProcessService1.java",
@@ -186,7 +188,7 @@ android_library("shell_apk_javatests") {
 junit_binary("webapk_shell_apk_junit_tests") {
   java_files = [
     "junit/src/org/chromium/webapk/shell_apk/HostBrowserClassLoaderTest.java",
-    "junit/src/org/chromium/webapk/shell_apk/MainActivityTest.java",
+    "junit/src/org/chromium/webapk/shell_apk/RecentsPlaceholderActivityTest.java",
   ]
   deps = [
     ":webapk_java",