Make service tab launcher a component

chrome/android/java/src/org/chromium/chrome/browser/ServiceTabLauncher.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 org.chromium.chrome.browser;
-
-import android.content.Context;
-import android.content.pm.ApplicationInfo;
-import android.content.pm.PackageManager;
-import android.content.pm.PackageManager.NameNotFoundException;
-import android.util.Log;
-
-import org.chromium.base.CalledByNative;
-import org.chromium.content_public.browser.WebContents;
-
-/**
- * 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 abstract class ServiceTabLauncher {
-    private static final String TAG = ServiceTabLauncher.class.getSimpleName();
-    private static final String SERVICE_TAB_LAUNCHER_KEY =
-            "org.chromium.chrome.browser.SERVICE_TAB_LAUNCHER";
-
-    // Name of the extra containing the Id of a tab launch request id.
-    public static final String LAUNCH_REQUEST_ID_EXTRA =
-            "org.chromium.chrome.browser.ServiceTabLauncher.LAUNCH_REQUEST_ID";
-
-    private static ServiceTabLauncher sInstance;
-
-    /**
-     * Launches the browser activity and launches a tab for |url|.
-     *
-     * @param context The context using which the URL is being loaded.
-     * @param requestId Id of the request for launching this tab.
-     * @param incognito Whether the tab should be launched in incognito mode.
-     * @param url The URL which should be launched in a tab.
-     * @param disposition The disposition requested by the navigation source.
-     * @param referrerUrl URL of the referrer which is opening the page.
-     * @param referrerPolicy The referrer policy to consider when applying the referrer.
-     * @param extraHeaders Extra headers to apply when requesting the tab's URL.
-     * @param postData Post-data to include in the tab URL's request body.
-     */
-    @CalledByNative
-    public abstract void launchTab(Context context, int requestId, boolean incognito, String url,
-                                   int disposition, String referrerUrl, int referrerPolicy,
-                                   String extraHeaders, byte[] postData);
-
-    /**
-     * Returns the active instance of the ServiceTabLauncher. If none exists, a meta-data key will
-     * be read from the AndroidManifest.xml file to determine the class which implements the
-     * service tab launcher activity. If that fails, NULL will be returned instead.
-     *
-     * We need to do this run-around because the ServiceTabLauncher must be available from
-     * background services, where no activity may be alive. Furthermore, no browser shell code has
-     * to be involved in the process at all, which means that there's no common location where we
-     * can inject a delegate in the start-up paths.
-     *
-     * @param Context The application context for the running service.
-     */
-    @CalledByNative
-    private static ServiceTabLauncher getInstance(Context context) throws Exception {
-        if (sInstance == null) {
-            Class<?> implementation = getServiceTabLauncherClassFromManifest(context);
-            if (implementation != null) {
-                sInstance = (ServiceTabLauncher) implementation.newInstance();
-            }
-        }
-
-        return sInstance;
-    }
-
-    /**
-     * Reads the SERVICE_TAB_LAUNCHER_KEY from the manifest and returns the Class it
-     * refers to. If the class cannot be found, NULL will be returned instead.
-     *
-     * @param context The application context used to get the package name and manager.
-     */
-    private static Class<?> getServiceTabLauncherClassFromManifest(Context context) {
-        try {
-            ApplicationInfo info = context.getPackageManager().getApplicationInfo(
-                    context.getPackageName(), PackageManager.GET_META_DATA);
-            String className = info.metaData.getString(SERVICE_TAB_LAUNCHER_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 SERVICE_TAB_LAUNCHER in the Android manifest file.");
-        }
-
-        return null;
-    }
-
-    /**
-     * To be called by the activity when the WebContents for |requestId| has been created, or has
-     * been recycled from previous use. The |webContents| must not yet have started provisional
-     * load for the main frame.
-     *
-     * @param requestId Id of the tab launching request which has been fulfilled.
-     * @param webContents The WebContents instance associated with this request.
-     */
-    public static void onWebContentsForRequestAvailable(int requestId, WebContents webContents) {
-        nativeOnWebContentsForRequestAvailable(requestId, webContents);
-    }
-
-    private static native void nativeOnWebContentsForRequestAvailable(
-            int requestId, WebContents webContents);
-}