Add a default share button to the menu of Custom Tabs

chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java

 // Copyright 2015 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 android.support.customtabs;
 
 import android.app.Activity;
 import android.app.ActivityOptions;
 import android.app.PendingIntent;
 import android.content.Intent;
@@ skipping 74 matching lines @@
     /**
      * Bundle constructed out of {@link ActivityOptions} that will be running when the
      * {@link Activity} that holds the custom tab gets finished. A similar ActivityOptions
      * for creation should be constructed and given to the startActivity() call that
      * launches the custom tab.
      */
     public static final String EXTRA_EXIT_ANIMATION_BUNDLE =
             "android.support.customtabs.extra.EXIT_ANIMATION_BUNDLE";
 
     /**
+     * Boolean that specifies whether a default share button will be shown in the menu.
+     */
+    public static final String EXTRA_DEFAULT_SHARE_MENU_ITEM =
+            "android.support.customtabs.extra.SHARE_MENU_ITEM";
+
+    /**
      * Convenience method to create a VIEW intent without a session for the given package.
      * @param packageName The package name to set in the intent.
      * @param data        The data {@link Uri} to be used in the intent.
      * @return            The intent with the given package, data and the right session extra.
      */
     public static Intent getViewIntentWithNoSession(String packageName, Uri data) {
         Intent intent = new Intent(Intent.ACTION_VIEW, data);
         intent.setPackage(packageName);
         Bundle extras = new Bundle();
         if (!safePutBinder(extras, EXTRA_SESSION, null)) return null;
@@ skipping 18 matching lines @@
                         Bundle.class.getMethod("putIBinder", String.class, IBinder.class);
                 putBinderMethod.invoke(bundle, key, binder);
             }
         } catch (InvocationTargetException | IllegalAccessException | IllegalArgumentException
                 | NoSuchMethodException e) {
             return false;
         }
         return true;
     }
 }