Refactor the INSTALL_SHORTCUT broadcast code into ChromeShortcutManager

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

+// 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.
+
+package org.chromium.chrome.browser.webapps;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+
+import org.chromium.chrome.browser.ChromeApplication;
+import org.chromium.chrome.browser.ShortcutHelper;
+
+import java.util.List;
+
+/**
+ * This class helps to add a shortcut to the Android Home Screen.  It also tells if
+ * addShortcutToHomeScreen is supported or not.
+ */
+public class ChromeShortcutManager {
+    private static ChromeShortcutManager sInstance;
+
+    /* Returns the singleton instance of ChromeShortcutManager, creating it if needed. */
+    public static ChromeShortcutManager getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = ((ChromeApplication) context.getApplicationContext())
+                                .createChromeShortcutManager();
+        }
+        return sInstance;
+    }
+
+    public void addShortcutToHomeScreen(final Context context, final Intent intent) {

[dominickn, 2017/02/13 05:18:02]

Instead of taking an Intent, can this take the id, shortcutTitle, bitmap, and
shortcutIntent so that the INSTALL_SHORTCUT constant can be moved into here?

[Marti Wong, 2017/02/14 02:42:47]

Done.

+        context.sendBroadcast(intent);
+    }
+
+    // TODO(crbug.com/635567): Fix this properly.
+    @SuppressLint("WrongConstant")
+    public boolean isAddShortcutToHomeScreenSupported(final Context context) {

[dominickn, 2017/02/13 05:18:02]

Perhaps call this canAddShortcutToHomescreen()

[Marti Wong, 2017/02/14 02:42:47]

Done.

+        PackageManager pm = context.getPackageManager();
+        Intent i = new Intent(ShortcutHelper.INSTALL_SHORTCUT);
+        List<ResolveInfo> receivers =
+                pm.queryBroadcastReceivers(i, PackageManager.GET_INTENT_FILTERS);
+        return !receivers.isEmpty();
+    }
+
+    public boolean canShowAddedToHomescreenToast(final Context context) {

[dominickn, 2017/02/13 05:18:02]

Maybe call this shouldShowAddedToHomescreenToast()? canShow makes it sound like
there are times when you can't show it (as opposed to times when we should not
show it)

[Marti Wong, 2017/02/14 02:42:47]

Done.

+        return true;
+    }
+}