Add a chrome://webapks page.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebapkInfoCallback.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebapkInfoCallback.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebapkInfoCallback.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebapkInfoCallback.java
new file mode 100644
index 0000000000000000000000000000000000000000..2288622cd627c9372b7542b714d069f89dc4b821
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebapkInfoCallback.java
@@ -0,0 +1,51 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.

[hartmanng, 2017/01/13 15:40:21]

Update the year - it's 2017 now :)

[gonzalon, 2017/01/13 20:24:38]

I copy pasted this everywhere without checking the year, sorry :(

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.webapps;
+
+import org.chromium.base.annotations.CalledByNative;
+
+/** A simple callback to load the information on web APKs. */
+public class WebapkInfoCallback {

[Xi Han, 2017/01/13 15:50:15]

Anyone has suggestion about the naming of this class?

+    private long mNativeWebapkInfoCallback;
+
+    /**
+     * Called with information of one Web APK. When information is requested, it will be called once

[hartmanng, 2017/01/13 15:40:21]

nit: for consistency, we generally spell it "WebAPK" without the space.

[gonzalon, 2017/01/13 20:24:38]

Done.

+     * for each Web APK installed on the device.
+     *
+     * @param name The name of the Web APK.
+     * @param packageName The package name of the Web APK.
+     * @param shellApkVersion The version of the shell APK of the Web APK.
+     * @param versionCode The version code associated with the Web APK.
+     */
+    public void onWebApkFound(
+            String name, String packageName, int shellApkVersion, int versionCode) {
+        nativeOnWebApkFound(
+                mNativeWebapkInfoCallback, name, packageName, shellApkVersion, versionCode);
+    }
+
+    /** Destroys the native counterpart of this object. */
+    public void destroy() {

[pkotwicz, 2017/01/13 17:00:58]

I must be missing something. Who calls destroy()?

[gonzalon, 2017/01/13 20:24:38]

I forgot to add the call, I added it on the listWebApks method.

+        nativeDestroy(mNativeWebapkInfoCallback);
+        mNativeWebapkInfoCallback = 0;
+    }
+
+    /**
+     * Called from C++ by |nativeWebApkInfoCallback| to instantiate this class. Note that this is
+     * the only way to construct an WebapkInfoCallback; the constructor is private.
+     * @param nativeWebApkInfoCallback The native counterpart that creates and owns this object.
+     */
+    @CalledByNative
+    private static WebapkInfoCallback create(long nativeWebApkInfoCallback) {
+        return new WebapkInfoCallback(nativeWebApkInfoCallback);
+    }
+
+    private WebapkInfoCallback(long nativeWebapkInfoCallback) {
+        mNativeWebapkInfoCallback = nativeWebapkInfoCallback;
+    }
+
+    private native void nativeOnWebApkFound(long nativeWebapkInfoCallback, String name,
+            String packageName, int shellApkVersion, int versionCode);
+    private native void nativeDestroy(long nativeWebapkInfoCallback);
+}