Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/document/DocumentMigrationHelper.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/document/DocumentMigrationHelper.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/document/DocumentMigrationHelper.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/document/DocumentMigrationHelper.java
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index 0000000000000000000000000000000000000000..250f8c1848b50ff617e9566f7aedcca6bd1d7a04
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@@ -0,0 +1,458 @@
+// 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.document;
+
+import android.annotation.TargetApi;
+import android.app.Activity;
+import android.app.ActivityManager;
+import android.app.ActivityManager.AppTask;
+import android.app.ActivityManager.TaskDescription;
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.os.Build;
+import android.text.TextUtils;
+import android.util.Log;
+import android.util.Pair;
+import android.util.SparseArray;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.ApplicationStatus;
+import org.chromium.base.ImportantFileWriterAndroid;
+import org.chromium.chrome.browser.ApplicationLifetime;
+import org.chromium.chrome.browser.ChromeMobileApplication;
+import org.chromium.chrome.browser.IntentHandler;
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.TabState;
+import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.UrlUtilities;
+import org.chromium.chrome.browser.compositor.layouts.content.ContentOffsetProvider;
+import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager.DecompressThumbnailCallback;
+import org.chromium.chrome.browser.device.DeviceClassManager;
+import org.chromium.chrome.browser.favicon.FaviconHelper;
+import org.chromium.chrome.browser.favicon.FaviconHelper.FaviconImageCallback;
+import org.chromium.chrome.browser.ntp.NativePageFactory;
+import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
+import org.chromium.chrome.browser.profiles.Profile;
+import org.chromium.chrome.browser.tabmodel.TabPersistentStore;
+import org.chromium.chrome.browser.tabmodel.TabPersistentStore.OnTabStateReadCallback;
+import org.chromium.chrome.browser.tabmodel.document.ActivityDelegate;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModel;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModel.Entry;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModel.InitializationObserver;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelImpl;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelSelector;
+import org.chromium.chrome.browser.tabmodel.document.OffTheRecordDocumentTabModel;
+import org.chromium.chrome.browser.tabmodel.document.StorageDelegate;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The class that carries out migration of tab states from/to document mode.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class DocumentMigrationHelper {
+    private static final String TAG = "DocumentMigrationHelper";
+    private static final int[] ICON_TYPES = {FaviconHelper.FAVICON,
+        FaviconHelper.TOUCH_ICON | FaviconHelper.TOUCH_PRECOMPOSED_ICON};
+    private static final int DESIRED_ICON_SIZE_DP = 32;
+
+    public static final int FINALIZE_MODE_NO_ACTION = 0;
+    public static final int FINALIZE_MODE_FINISH_ACTIVITY = 1;
+    public static final int FINALIZE_MODE_RESTART_APP = 2;
+
+    private static class MigrationTabStateReadCallback implements OnTabStateReadCallback {
+        private int mSelectedTabId = Tab.INVALID_TAB_ID;
+
+        @Override
+        public void onDetailsRead(int index, int id, String url, boolean isStandardActiveIndex,
+                boolean isIncognitoActiveIndex) {
+            Tab.incrementIdCounterTo(id + 1);
+            if (!isStandardActiveIndex) return;
+            // If the current tab read is the active standard tab, set the last used
+            // tab pref with the id, so that when document mode starts we show that
+            // tab first.
+            mSelectedTabId = id;
+        }
+
+        public int getSelectedTabId() {
+            return mSelectedTabId;
+        }
+    }
+
+    /**
+     * Stores a list of "tasks" that are meant to be returned by the ActivityManager for migration.
+     * The tasks are inserted manually during the migration from classic mode to document mode.
+     */
+    private static class MigrationActivityDelegate extends ActivityDelegate {
+        private final List<Entry> mEntries;
+        private final int mSelectedTabId;
+
+        private MigrationActivityDelegate(List<Entry> entries, int selectedTabId) {
+            super(DocumentActivity.class, IncognitoDocumentActivity.class);
+            mEntries = entries;
+            mSelectedTabId = selectedTabId;
+        }
+
+        public int getSelectedTabId() {
+            return mSelectedTabId;
+        }
+
+        @Override
+        public boolean isValidActivity(boolean isIncognito, Intent intent) {
+            return true;
+        }
+
+        @Override
+        public List<Entry> getTasksFromRecents(boolean isIncognito) {
+            // We need to have our own list here, since these entries have not actually been
+            // created in Recents yet.
+            return mEntries;
+        }
+    }
+
+    private static class MigrationTabModel extends DocumentTabModelImpl {
+        private final SparseArray<String> mTitleList;
+
+        /**
+         * Constucts a {@link DocumentTabModel} to be used for migration.
+         * @param activityDelegate The delegate that has the tabs to be migrated.
+         * @param storageDelegate Delegate that interacts with the file system.
+         */
+        MigrationTabModel(MigrationActivityDelegate activityDelegate,
+                StorageDelegate storageDelegate) {
+            super(activityDelegate, storageDelegate, new TabDelegateImpl(), false,
+                    Tab.INVALID_TAB_ID, ApplicationStatus.getApplicationContext());
+            startTabStateLoad();
+            mTitleList = new SparseArray<String>();
+            setLastShownId(activityDelegate.getSelectedTabId());
+        }
+
+        /**
+         * Returns the display title for the Document with the given ID.
+         * @param tabId The ID for the document to return the url for.
+         * @return The display title for the entry if it was found, null otherwise.
+         */
+        public String getTitleForDocument(int tabId) {
+            String title = mTitleList.get(tabId);
+            return TextUtils.isEmpty(title) ? "" : title;
+        }
+
+        @Override
+        protected boolean shouldStartDeserialization(int currentState) {
+            return currentState == STATE_LOAD_TAB_STATE_BG_END;
+        }
+
+        @Override
+        protected void updateEntryInfoFromTabState(Entry entry, TabState tabState) {
+            super.updateEntryInfoFromTabState(entry, tabState);
+            mTitleList.put(entry.tabId, tabState.getDisplayTitleFromState());
+        }
+    }
+
+    /**
+     * Migrates all tab state to classic mode and creates a tab model file using the current
+     * {@link DocumentTabModel} instances.
+     * @param activity The activity to be finished after migration if necessary.
+     * @param finalizeMode The mode in which the migration should be finalized.
+     */
+    public static void migrateTabsFromDocumentToClassic(final Activity activity,
+            int finalizeMode) {
+        Context context = ApplicationStatus.getApplicationContext();
+        // Before migration we remove all incognito tabs and also remove the
+        // tabs that can not be reached through the {@link DocumentTabModel} instances.
+        List<Integer> tabIdsToRemove = new ArrayList<Integer>();
+
+        DocumentTabModelImpl normalTabModel = (DocumentTabModelImpl)
+                ChromeMobileApplication.getDocumentTabModelSelector().getModel(false);
+        OffTheRecordDocumentTabModel incognitoTabModel = (OffTheRecordDocumentTabModel)
+                ChromeMobileApplication.getDocumentTabModelSelector().getModel(true);
+
+        // TODO(yusufo): Clean up this logic.
+        for (int i = 0; i < incognitoTabModel.getCount(); i++) {
+            tabIdsToRemove.add(incognitoTabModel.getTabAt(i).getId());
+        }
+
+        ActivityManager am =
+                (ActivityManager) context.getSystemService(Activity.ACTIVITY_SERVICE);
+        List<AppTask> taskList = am.getAppTasks();
+        for (int i = 0; i < taskList.size(); i++) {
+            Intent intent = DocumentUtils.getBaseIntentFromTask(taskList.get(i));
+            int id = ActivityDelegate.getTabIdFromIntent(intent);
+            if (id == Tab.INVALID_TAB_ID) continue;
+            if (tabIdsToRemove.contains(id)) taskList.get(i).finishAndRemoveTask();
+        }
+        incognitoTabModel.updateRecentlyClosed();
+
+        File migratedFolder = TabPersistentStore.getStateDirectory(context, 0);
+        String tabStatefileName = new File(migratedFolder,
+                TabPersistentStore.SAVED_STATE_FILE).getAbsolutePath();
+
+        // All the TabStates (incognito or not) live in the same directory.
+        File[] allTabs = normalTabModel.getStorageDelegate().getStateDirectory().listFiles();
+        try {
+            for (int i = 0; i < allTabs.length; i++) {
+                String fileName = allTabs[i].getName();
+                Pair<Integer, Boolean> tabInfo = TabState.parseInfoFromFilename(fileName);
+                if (tabInfo == null) continue;
+                int tabId = tabInfo.first;
+
+                // Also remove the tab state file for the closed tabs.
+                boolean success;
+                if (!tabIdsToRemove.contains(tabId)) {
+                    success = allTabs[i].renameTo(new File(migratedFolder, fileName));
+                } else {
+                    success = allTabs[i].delete();
+                }
+
+                if (!success) Log.e(TAG, "Failed to move/delete file for tab ID: " + tabId);
+            }
+
+            if (normalTabModel.getCount() != 0) {
+                byte[] listData;
+                listData = TabPersistentStore.serializeTabLists(incognitoTabModel, normalTabModel);
+                ImportantFileWriterAndroid.writeFileAtomically(tabStatefileName, listData);
+            }
+        } catch (IOException e) {
+            Log.e(TAG , "IO exception during tab migration, tab state might not restore correctly");
+        }
+        finalizeMigration(activity, finalizeMode);
+    }
+
+    /**
+     * Migrates all tab state to document mode and creates tasks for each currently open tab.
+     * @param activity Activity to be used while launching the tasks.
+     * @param finalizeMode The mode in which the migration should be finalized.
+     */
+    public static void migrateTabsFromClassicToDocument(
+            final Activity activity, final int finalizeMode) {
+        StorageDelegate storageDelegate = new StorageDelegate();
+        MigrationActivityDelegate activityDelegate =
+                createActivityDelegateWithTabsToMigrate(storageDelegate, activity);
+        final MigrationTabModel normalTabModel =
+                new MigrationTabModel(activityDelegate, storageDelegate);
+
+        InitializationObserver observer = new InitializationObserver(normalTabModel) {
+            @Override
+            protected void runImmediately() {
+                addAppTasksFromFiles(activity, normalTabModel, finalizeMode);
+            }
+
+            @Override
+            public boolean isSatisfied(int currentState) {
+                return currentState == DocumentTabModelImpl.STATE_DESERIALIZE_END;
+            }
+
+            @Override
+            public boolean isCanceled() {
+                return false;
+            }
+        };
+
+        observer.runWhenReady();
+    }
+
+    /**
+     * Migrate tabs saved in classic mode to document mode for an upgrade. This doesn't restart
+     * the app process but only finishes the {@link ChromeLauncherActivity} it was being called
+     * with.
+     * @param activity The activity to use for carrying out and finalizing the migration.
+     * @param finalizeMode The mode in which the migration should be finalized.
+     * @return Whether any tabs will be migrated.
+     */
+    public static boolean migrateTabsToDocumentForUpgrade(Activity activity,
+            int finalizeMode) {
+        ChromePreferenceManager.getInstance(activity).setAttemptedMigrationOnUpgrade();
+        File[] fileList = TabPersistentStore.getStateDirectory(activity, 0).listFiles();
+        if (fileList == null || fileList.length == 0
+                || (fileList.length == 1
+                && fileList[0].getName().equals(TabPersistentStore.SAVED_STATE_FILE))) {
+            return false;
+        }
+
+        migrateTabsFromClassicToDocument(activity, finalizeMode);
+        return true;
+    }
+
+    private static void finalizeMigration(Activity activity, final int mode) {
+        switch(mode) {
+            case FINALIZE_MODE_NO_ACTION:
+                return;
+            case FINALIZE_MODE_FINISH_ACTIVITY:
+                activity.finishAndRemoveTask();
+                return;
+            case FINALIZE_MODE_RESTART_APP:
+                ApplicationLifetime.terminate(true);
+                return;
+            default:
+                assert false;
+        }
+    }
+
+    private static MigrationActivityDelegate createActivityDelegateWithTabsToMigrate(
+            StorageDelegate storageDelegate, Activity activity) {
+        File migratedFolder = storageDelegate.getStateDirectory();
+        if (!migratedFolder.exists() && !migratedFolder.mkdir()) {
+            Log.e(TAG, "Failed to create folder: " + migratedFolder.getAbsolutePath());
+        }
+
+        // Create maps for all tabs that will be used during TabModel initialization.
+        final List<Entry> normalEntryMap = new ArrayList<Entry>();
+
+        int currentSelectorIndex = 0;
+        File currentFolder = TabPersistentStore.getStateDirectory(activity, currentSelectorIndex);
+        MigrationTabStateReadCallback callback = new MigrationTabStateReadCallback();
+        while (currentFolder.listFiles() != null && currentFolder.listFiles().length != 0) {
+            File[] allTabs = TabPersistentStore
+                    .getStateDirectory(activity, currentSelectorIndex).listFiles();
+            try {
+                TabPersistentStore.readSavedStateFile(currentFolder, callback);
+            } catch (IOException e) {
+                Log.e(TAG, "IO Exception while trying to get the last used tab id");
+            }
+
+            for (int i = 0; i < allTabs.length; i++) {
+                // Move tab state file to the document side folder.
+                String fileName = allTabs[i].getName();
+                Pair<Integer, Boolean> tabInfo = TabState.parseInfoFromFilename(fileName);
+                if (tabInfo == null) continue;
+
+                boolean success;
+                if (tabInfo.second) {
+                    success = allTabs[i].delete();
+                } else {
+                    success = allTabs[i].renameTo(new File(migratedFolder, fileName));
+                    normalEntryMap.add(new Entry(tabInfo.first, UrlConstants.NTP_URL));
+                }
+
+                if (!success) Log.e(TAG, "Failed to move/delete file: " + fileName);
+            }
+            currentSelectorIndex++;
+            currentFolder = TabPersistentStore.getStateDirectory(activity, currentSelectorIndex);
+        }
+
+        return new MigrationActivityDelegate(normalEntryMap, callback.getSelectedTabId());
+    }
+
+    private static void addAppTasksFromFiles(final Activity activity,
+            final MigrationTabModel tabModel, final int finalizeMode) {
+        if (tabModel.getCount() == 0) {
+            finalizeMigration(activity, finalizeMode);
+            return;
+        }
+
+        final TabContentManager contentManager =
+                new TabContentManager(activity, new ContentOffsetProvider() {
+                    @Override
+                    public int getOverlayTranslateY() {
+                        return 0;
+                    }
+                }, DeviceClassManager.enableSnapshots());
+        FaviconHelper faviconHelper = new FaviconHelper();
+        for (int i = 0; i < tabModel.getCount(); i++) {
+            final int tabId = tabModel.getTabAt(i).getId();
+            String currentUrl = tabModel.getCurrentUrlForDocument(tabId);
+            String currentTitle = tabModel.getTitleForDocument(tabId);
+            final boolean finalizeWhenDone =  i == tabModel.getCount() - 1;
+
+            // Use placeholders if we can't find anything for url and title.
+            if (TextUtils.isEmpty(currentUrl)) currentUrl = UrlConstants.NTP_URL;
+            if (TextUtils.isEmpty(currentTitle)
+                    && !NativePageFactory.isNativePageUrl(currentUrl, false)) {
+                currentTitle = UrlUtilities.getDomainAndRegistry(currentUrl, false);
+            }
+            final String url = currentUrl;
+            final String title = currentTitle;
+
+            faviconHelper.getLargestRawFaviconForUrl(
+                    Profile.getLastUsedProfile().getOriginalProfile(),
+                    url, ICON_TYPES, DESIRED_ICON_SIZE_DP,
+                    new FaviconImageCallback() {
+                        @Override
+                        public void onFaviconAvailable(final Bitmap favicon, String iconUrl) {
+                            // Even if either the favicon or the thumbnail comes back null
+                            // add the AppTask with the return values. The framework handles a null
+                            // favicon and addAppTask below handles null thumbnails.
+                            DecompressThumbnailCallback thumbnailCallback =
+                                    new DecompressThumbnailCallback() {
+                                @Override
+                                public void onFinishGetBitmap(Bitmap bitmap) {
+                                    if (!NativePageFactory.isNativePageUrl(url, false)
+                                            && !url.startsWith(UrlConstants.CHROME_SCHEME)) {
+                                        addAppTask(activity, tabId,
+                                                tabModel.getTabStateForDocument(tabId),
+                                                url, title, favicon, bitmap);
+                                    }
+                                    // TODO(yusufo) : Have a counter here to make sure all tabs
+                                    //                before this one has been added.
+                                    if (finalizeWhenDone) {
+                                        finalizeMigration(activity, finalizeMode);
+                                    }
+                                }
+                            };
+                            contentManager.getThumbnailForId(tabId, thumbnailCallback);
+                        }
+                    });
+        }
+    }
+
+    private static void addAppTask(Activity activity, int tabId, TabState tabState,
+            String currentUrl, String title, Bitmap favicon, Bitmap bitmap) {
+        if (tabId == ActivityDelegate.getTabIdFromIntent(activity.getIntent())) return;
+        // Create intent and taskDescription.
+        Intent intent = new Intent(Intent.ACTION_VIEW,
+                DocumentTabModelSelector.createDocumentDataString(tabId, currentUrl));
+        intent.setClassName(activity, ChromeLauncherActivity.getDocumentClassName(false));
+        intent.putExtra(IntentHandler.EXTRA_PRESERVE_TASK, true);
+        ActivityManager am =
+                (ActivityManager) activity.getSystemService(Activity.ACTIVITY_SERVICE);
+
+        Bitmap thumbnail = Bitmap.createBitmap(am.getAppTaskThumbnailSize().getWidth(),
+                am.getAppTaskThumbnailSize().getHeight(), Config.ARGB_8888);
+        Canvas canvas = new Canvas(thumbnail);
+        if (bitmap == null) {
+            canvas.drawColor(Color.WHITE);
+        } else {
+            float scale = Math.max(
+                    (float) thumbnail.getWidth() / bitmap.getWidth(),
+                    (float) thumbnail.getHeight() / bitmap.getHeight());
+            canvas.scale(scale, scale);
+            canvas.drawBitmap(bitmap, 0, 0, null);
+        }
+        TaskDescription taskDescription = new TaskDescription(title, favicon,
+                activity.getResources().getColor(R.color.default_primary_color));
+        am.addAppTask(activity, intent, taskDescription, thumbnail);
+        Entry entry = new Entry(tabId, tabState);
+        DocumentTabModelImpl tabModel = (DocumentTabModelImpl) ChromeMobileApplication
+                .getDocumentTabModelSelector().getModel(false);
+        tabModel.addEntryForMigration(entry);
+    }
+
+
+    /**
+     * Migrates tabs with state to and from document mode.
+     * @param toDocumentMode Whether the user is opting out. If true the migration is from Document
+     *               to Classic mode.
+     * @param activity The activity to use for launching intent if needed.
+     * @param terminate Whether the application process should be terminated after the migration.
+     */
+    public static void migrateTabs(boolean toDocumentMode, final Activity activity,
+            boolean terminate) {
+        int terminateMode = terminate ? FINALIZE_MODE_RESTART_APP : FINALIZE_MODE_FINISH_ACTIVITY;
+        if (toDocumentMode) {
+            migrateTabsFromClassicToDocument(activity, terminateMode);
+        } else {
+            migrateTabsFromDocumentToClassic(activity, terminateMode);
+        }
+    }
+}