Chrome talks to Play to install WebAPKs.

chrome/browser/android/webapk/webapk_installer_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/webapk/webapk_installer.h"
 
 #include <jni.h>
 #include <memory>
 #include <string>
 
@@ skipping 34 matching lines @@
 
 // URL of file to download from the WebAPK server. We use a random file in the
 // test data directory.
 const char* kDownloadUrl = "/simple.html";
 
 // The package name of the downloaded WebAPK.
 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,
                       const SkBitmap& shortcut_icon)
       : WebApkInstaller(shortcut_info, shortcut_icon) {}
 
   bool StartInstallingDownloadedWebApk(
       JNIEnv* env,
       const base::android::ScopedJavaLocalRef<jstring>& file_path,
       const base::android::ScopedJavaLocalRef<jstring>& package_name) override {
     PostTaskToRunSuccessCallback();
     return true;
   }
 
   bool StartUpdateUsingDownloadedWebApk(
       JNIEnv* env,
       const base::android::ScopedJavaLocalRef<jstring>& file_path) override {
     return true;
   }
 
+  bool HasGooglePlayWebApkInstallDelegate() override {
+    return false;
+  }
+
   void PostTaskToRunSuccessCallback() {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(&TestWebApkInstaller::OnSuccess, base::Unretained(this)));
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWebApkInstaller);
 };
 
@@ skipping 237 matching lines @@
   std::unique_ptr<WebApkInstallerRunner> runner = CreateWebApkInstallerRunner();
   runner->RunInstallWebApk();
   EXPECT_FALSE(runner->success());
 }
 
 // Test update succeeding.
 TEST_F(WebApkInstallerTest, UpdateSuccess) {
   std::unique_ptr<WebApkInstallerRunner> runner = CreateWebApkInstallerRunner();
   runner->RunUpdateWebApk();
   EXPECT_TRUE(runner->success());
 }

[pkotwicz, 2016/12/02 22:27:04]

Can you add a test testing the Google Play installation path?
Make sure that OnComplete() is eventually called

[Xi Han, 2016/12/05 17:27:54]

Done.