Determine whether to show "Add to Homescreen" dialog or WebAPK infobar

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/AddToHomescreenManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/AddToHomescreenManager.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/AddToHomescreenManager.java
new file mode 100644
index 0000000000000000000000000000000000000000..ffec6c8fee258c240d3a8e8ec98952d9f7abb08d
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/AddToHomescreenManager.java
@@ -0,0 +1,99 @@
+// 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.
+
+package org.chromium.chrome.browser.webapps;
+
+import android.app.Activity;
+import android.graphics.Bitmap;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.content_public.browser.WebContents;
+
+/**
+ * Manages the add-to-homescreen process.
+ */
+public class AddToHomescreenManager {
+
+    /** Interface for tracking fetch of add-to-homescreen data. */
+    public interface Observer {
+        /** Called when the title of the page is available. */
+        void onUserTitleAvailable(String title);
+
+        /**
+         * Called once native has finished fetching the homescreen shortcut's data (like the Web
+         * Manifest) and is ready for {@link AddToHomescreenDelegate#addShortcut()} to be called.
+         * @param icon Icon to use in the launcher.
+         */
+        void onReadyToAdd(Bitmap icon);
+    }
+
+    private final Activity mActivity;
+    private final Tab mTab;
+
+    private Observer mObserver;
+    private long mNativeAddToHomescreenManager;
+
+    public AddToHomescreenManager(Activity activity, Tab tab) {
+        mActivity = activity;
+        mTab = tab;
+    }
+
+    /** Starts add-to-homescreen process. */
+    public void start() {
+        mNativeAddToHomescreenManager = nativeInitializeAndStart(mTab.getWebContents());
+    }
+
+    /** Sets the add-to-homescreen observer tracking the add-to-homescreen data fetch. */
+    public void setObserver(Observer observer) {
+        mObserver = observer;
+    }
+
+    /**
+     * Puts the object in a state where it is safe to be destroyed.
+     */
+    public void destroy() {
+        nativeDestroy(mNativeAddToHomescreenManager);
+
+        mObserver = null;
+        mNativeAddToHomescreenManager = 0;
+    }
+
+    /**
+     * Adds a shortcut for the current Tab.
+     * @param userRequestedTitle Title of the shortcut displayed on the homescreen.
+     */
+    public void addShortcut(String userRequestedTitle) {
+        nativeAddShortcut(mNativeAddToHomescreenManager, userRequestedTitle);
+    }
+
+    public void onDismissed() {
+        destroy();
+    }
+
+    /**
+     * Shows alert to prompt user for name of home screen shortcut.
+     */
+    @CalledByNative
+    public void showDialog() {
+        AddToHomescreenDialog dialog = new AddToHomescreenDialog(this);
+        dialog.show(mActivity);
+        setObserver(dialog);
+    }
+
+    @CalledByNative
+    private void onUserTitleAvailable(String title) {
+        mObserver.onUserTitleAvailable(title);
+    }
+
+    @CalledByNative
+    private void onReadyToAdd(Bitmap icon) {
+        mObserver.onReadyToAdd(icon);
+    }
+
+    private native long nativeInitializeAndStart(WebContents webContents);
+    private native void nativeAddShortcut(
+            long nativeAddToHomescreenManager, String userRequestedTitle);
+    private native void nativeDestroy(long nativeAddToHomescreenManager);
+}