Add PhysicalWebBroadcastService

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebShareActivity.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.physicalweb;
 
+import android.app.Activity;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 
+import org.chromium.base.ApplicationStatus;
+import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.share.ShareHelper;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.util.IntentUtils;
 
+import java.lang.ref.WeakReference;
+import java.util.List;
 /**
  * A simple activity that allows Chrome to start the physical web sharing service.
  */
 public class PhysicalWebShareActivity extends AppCompatActivity {
     private static final String TAG = "PhysicalWebShareActivity";
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         try {
             Intent intent = getIntent();
             if (intent == null) return;
             if (!Intent.ACTION_SEND.equals(intent.getAction())) return;
             if (!IntentUtils.safeHasExtra(getIntent(), ShareHelper.EXTRA_TASK_ID)) return;
             handleShareAction();
         } finally {
             finish();
         }
     }
 
     private void handleShareAction() {
-        // TODO(iankc): implement sharing
+        ChromeActivity openPage = getTriggeringActivity();
+        if (openPage == null) return;
+
+        Intent intent = new Intent(this, PhysicalWebBroadcastService.class);
+        intent.putExtra(
+                PhysicalWebBroadcastService.DISPLAY_URL_KEY, openPage.getActivityTab().getUrl());
+        startService(intent);
     }
 
     public static boolean sharingIsEnabled(Tab currentTab) {
         return PhysicalWeb.sharingIsEnabled() && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M;
     }
+
+    /**
+     * Returns the ChromeActivity that called the share intent picker.
+     */
+    protected ChromeActivity getTriggeringActivity() {

[cco3, 2017/02/25 00:09:26]

If we have to add code like this, I'd prefer you make a change to create an
abstract ShareActivity first.

+        int triggeringTaskId =
+                IntentUtils.safeGetIntExtra(getIntent(), ShareHelper.EXTRA_TASK_ID, 0);
+        List<WeakReference<Activity>> activities = ApplicationStatus.getRunningActivities();
+        ChromeActivity triggeringActivity = null;
+        for (int i = 0; i < activities.size(); i++) {
+            Activity activity = activities.get(i).get();
+            if (activity == null) continue;
+
+            // Since the share intent is triggered without NEW_TASK or NEW_DOCUMENT, the task ID
+            // of this activity will match that of the triggering activity.
+            if (activity.getTaskId() == triggeringTaskId && activity instanceof ChromeActivity) {
+                return (ChromeActivity) activity;
+            }
+        }
+        return null;
+    }
 }