Add a chrome://webapks page.

chrome/browser/ui/webui/webapk_info_callback.h

Index: chrome/browser/ui/webui/webapk_info_callback.h
diff --git a/chrome/browser/ui/webui/webapk_info_callback.h b/chrome/browser/ui/webui/webapk_info_callback.h
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+// Copyright 2017 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_UI_WEBUI_WEBAPK_INFO_CALLBACK_H_
+#define CHROME_BROWSER_UI_WEBUI_WEBAPK_INFO_CALLBACK_H_
+
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+
+// A callback wrapper for fetching information regarding the WebAPKs installed
+// on the Android device.
+class WebApkInfoCallback {
+ public:
+  explicit WebApkInfoCallback(
+      const base::RepeatingCallback<void(std::string, std::string, int, int)>&
+          callback);
+  ~WebApkInfoCallback();
+
+  // Destroys this object.
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+
+  // Fetches a list of the WebAPKs installed in the device, including their
+  // package name and version info.
+  void MakeInfoRequest(JNIEnv* env);
+
+  // Called by Java code with information about a WebAPK. It will be called
+  // once for each one installed in the device.
+  void OnWebApkFound(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& obj,
+                     const base::android::JavaParamRef<jstring>& name,
+                     const base::android::JavaParamRef<jstring>& package_name,
+                     const jint j_shell_apk_version,
+                     const jint j_version_code) const;
+
+  // JNI registration.
+  static bool Register(JNIEnv* env);
+
+ private:
+  // The wrapped native filter.
+  base::RepeatingCallback<void(std::string, std::string, int, int)> callback_;
+
+  // The Java counterpart of this C++ object.
+  base::android::ScopedJavaGlobalRef<jobject> j_webapk_info_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebApkInfoCallback);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_WEBAPK_INFO_CALLBACK_H_