Chrome talks to Play to install WebAPKs.

chrome/browser/android/webapk/webapk_installer_unittest.cc

Index: chrome/browser/android/webapk/webapk_installer_unittest.cc
diff --git a/chrome/browser/android/webapk/webapk_installer_unittest.cc b/chrome/browser/android/webapk/webapk_installer_unittest.cc
index 10021ff93107a0b7e7a694291742e2e107c0910b..d94322632930ed9a1dd0e7f18ed8b5b3bffa617f 100644
--- a/chrome/browser/android/webapk/webapk_installer_unittest.cc
+++ b/chrome/browser/android/webapk/webapk_installer_unittest.cc
@@ -52,7 +52,8 @@ const char* kDownloadedWebApkPackageName = "party.unicode";
 
 // WebApkInstaller subclass where
 // WebApkInstaller::StartInstallingDownloadedWebApk() and
-// WebApkInstaller::StartUpdateUsingDownloadedWebApk() are stubbed out.
+// WebApkInstaller::StartUpdateUsingDownloadedWebApk() and
+// WebApkInstaller::HasGooglePlayWebApkInstallDelegate() are stubbed out.
 class TestWebApkInstaller : public WebApkInstaller {
  public:
   TestWebApkInstaller(const ShortcutInfo& shortcut_info,
@@ -73,6 +74,10 @@ class TestWebApkInstaller : public WebApkInstaller {
     return true;
   }
 
+  bool HasGooglePlayWebApkInstallDelegate() override {
+    return false;
+  }
+
   void PostTaskToRunSuccessCallback() {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,