First step in enabling creating tabs without an Activity on Android.

chrome/android/java/src/org/chromium/chrome/browser/ServiceTabLauncher.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ServiceTabLauncher.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ServiceTabLauncher.java b/chrome/android/java/src/org/chromium/chrome/browser/ServiceTabLauncher.java
new file mode 100644
index 0000000000000000000000000000000000000000..f8d3d72decafb609962fc703fe6938b35fb924cc
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ServiceTabLauncher.java
@@ -0,0 +1,101 @@
+// 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 org.chromium.chrome.browser;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.net.Uri;
+import android.provider.Browser;
+import android.util.Log;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.ui.WindowOpenDisposition;
+
+/**
+ * Tab Launcher to be used to launch new tabs from background Android Services, when it is not
+ * known whether an activity is available. It will send an intent to launch the activity.
+ *
+ * TODO(peter): Have the activity confirm that the tab has been launched.
+ */
+public class ServiceTabLauncher {
+    private static final String TAG = ServiceTabLauncher.class.getSimpleName();
+
+    private static final String BROWSER_ACTIVITY_KEY =
+            "org.chromium.chrome.browser.BROWSER_ACTIVITY";
+    private static final String EXTRA_OPEN_NEW_INCOGNITO_TAB =
+            "com.google.android.apps.chrome.EXTRA_OPEN_NEW_INCOGNITO_TAB";
+
+    private final long mNativeServiceTabLauncher;
+    private final Context mContext;
+
+    @CalledByNative
+    private static ServiceTabLauncher create(long nativeServiceTabLauncher, Context context) {
+        return new ServiceTabLauncher(nativeServiceTabLauncher, context);
+    }
+
+    private ServiceTabLauncher(long nativeServiceTabLauncher, Context context) {
+        mNativeServiceTabLauncher = nativeServiceTabLauncher;
+        mContext = context;
+    }
+
+    /**
+     * Launches the browser activity and launches a tab for |url|.
+     *
+     * @param url The URL which should be launched in a tab.
+     * @param disposition The disposition requested by the navigation source.
+     * @param incognito Whether the tab should be launched in incognito mode.
+     */
+    @CalledByNative
+    private void launchTab(String url, int disposition, boolean incognito) {
+        Intent intent = new Intent(mContext, getBrowserActivityClassFromManifest());
+        intent.setAction(Intent.ACTION_MAIN);
+        intent.addCategory(Intent.CATEGORY_LAUNCHER);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.setData(Uri.parse(url));
+
+        switch (disposition) {
+            case WindowOpenDisposition.NEW_WINDOW:
+            case WindowOpenDisposition.NEW_POPUP:
+            case WindowOpenDisposition.NEW_FOREGROUND_TAB:
+            case WindowOpenDisposition.NEW_BACKGROUND_TAB:
+                // The browser should attempt to create a new tab.
+                intent.putExtra(Browser.EXTRA_CREATE_NEW_TAB, true);
+                break;
+            default:
+                // The browser should attempt to re-use an existing tab.
+                break;
+        }
+
+        if (incognito) intent.putExtra(EXTRA_OPEN_NEW_INCOGNITO_TAB, true);
+
+        // TODO(peter): Add the referrer information when applicable.
+
+        mContext.startActivity(intent);
+    }
+
+    /**
+     * Reads the BROWSER_ACTIVITY name from the meta data in the Android Manifest file.
+     *
+     * @return Class for the browser activity to use when launching tabs.
+     */
+    private Class<?> getBrowserActivityClassFromManifest() {
+        try {
+            ApplicationInfo info = mContext.getPackageManager().getApplicationInfo(
+                    mContext.getPackageName(), PackageManager.GET_META_DATA);
+            String className = info.metaData.getString(BROWSER_ACTIVITY_KEY);
+
+            return Class.forName(className);
+        } catch (NameNotFoundException e) {
+            Log.e(TAG, "Context.getPackage() refers to an invalid package name.");
+        } catch (ClassNotFoundException e) {
+            Log.e(TAG, "Invalid value for BROWSER_ACTIVITY in the Android manifest file.");
+        }
+
+        return null;
+    }
+}