Add calls to the server to request WebAPK updates.

chrome/browser/android/webapk/webapk_update_manager.h

+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_MANAGER_H_
+#define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_MANAGER_H_
+
+#include "base/android/jni_android.h"
+#include "base/macros.h"
+
+// WebApkUpdateManager is the C++ counterpart of org.chromium.chrome.browser's
+// WebApkUpdateManager in Java. It calls WebApkInstaller to send update request
+// to WebAPK Minting Server.

[pkotwicz, 2016/08/09 14:35:43]

Nits:
- "send update request" -> "send an update request"
- "WebAPK Minting Server" -> "WebAPK server". (At least I refer to the server as
the "WebAPK server in webapk_installer.cc)

[Xi Han, 2016/08/11 19:01:15]

Done.

+class WebApkUpdateManager {
+ public:
+  // Registers JNI hooks.
+  static bool Register(JNIEnv* env);
+
+  // Called after either a request to update the WebAPK has been sent, or the
+  // creation process of the new WebAPK fails.

[pkotwicz, 2016/08/09 14:35:43]

How about: ", or the creation process of the new WebAPK fails." -> "or the
update process fails."

[Xi Han, 2016/08/11 19:01:15]

Done.

+  // |success| indicates whether the request was issued to the server. A "true"
+  // value of |success| does not guarantee that the WebAPK will be successfully
+  // installed.

[pkotwicz, 2016/08/09 14:35:43]

Nit: "installed" -> "updated"

[Xi Han, 2016/08/11 19:01:15]

Done.

+  static void OnBuiltWebApk(const std::string& webapk_package, bool success);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebApkUpdateManager);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_UPDATE_MANAGER_H_