Add Browser Actions tab model selector and open a tab through it if ChromeTabbedActivity is not ava…

chrome/android/java/src/org/chromium/chrome/browser/browseractions/BrowserActionsTabPersistencePolicy.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.browseractions;
+
+import android.os.StrictMode;
+
+import org.chromium.base.Callback;
+import org.chromium.base.Log;
+import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.tabmodel.TabPersistencePolicy;
+import org.chromium.chrome.browser.tabmodel.TabPersistentStore;
+
+import java.io.File;
+import java.util.List;
+import java.util.concurrent.Executor;
+
+import javax.annotation.Nullable;
+
+/**
+ * Handles the Browser Actions Tab specific behaviors of tab persistence.
+ */
+public class BrowserActionsTabPersistencePolicy implements TabPersistencePolicy {
+    static final String SAVED_STATE_DIRECTORY = "0";
+
+    private static final String TAG = "tabmodel";
+
+    /** Prevents two state directories from getting created simultaneously. */
+    private static final Object DIR_CREATION_LOCK = new Object();
+
+    private static File sStateDirectory;
+
+    @Override
+    public File getOrCreateStateDirectory() {
+        return getOrCreateBrowserActionsModeStateDirectory();
+    }
+
+    @Override
+    public String getStateFileName() {
+        return TabPersistentStore.getStateFileName("2");
+    }
+
+    @Override
+    public boolean shouldMergeOnStartup() {
+        return false;
+    }
+
+    @Override
+    @Nullable
+    public String getStateToBeMergedFileName() {
+        return null;
+    }
+
+    @Override
+    public boolean performInitialization(Executor executor) {
+        return true;
+    }
+
+    @Override
+    public void waitForInitializationToFinish() {}
+
+    @Override
+    public boolean isMergeInProgress() {
+        return false;
+    }
+
+    @Override
+    public void setMergeInProgress(boolean isStarted) {
+        assert false : "Merge not supported in Browser Actions";
+    }
+
+    @Override
+    public void cancelCleanupInProgress() {}
+
+    @Override
+    public void cleanupUnusedFiles(Callback<List<String>> filesToDelete) {}
+
+    @Override
+    public void setTabContentManager(TabContentManager cache) {}
+
+    @Override
+    public void notifyStateLoaded(int tabCountAtStartup) {}
+
+    @Override
+    public void destroy() {}
+
+    /**
+     * The folder where the state should be saved to.
+     * @return A file representing the directory that contains TabModelSelector states.
+     */
+    public static File getOrCreateBrowserActionsModeStateDirectory() {
+        synchronized (DIR_CREATION_LOCK) {
+            if (sStateDirectory == null) {
+                sStateDirectory = new File(
+                        TabPersistentStore.getOrCreateBaseStateDirectory(), SAVED_STATE_DIRECTORY);
+                StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskWrites();
+                try {
+                    if (!sStateDirectory.exists() && !sStateDirectory.mkdirs()) {
+                        Log.e(TAG, "Failed to create state folder: " + sStateDirectory);
+                    }
+                } finally {
+                    StrictMode.setThreadPolicy(oldPolicy);
+                }
+            }
+        }
+        return sStateDirectory;
+    }
+}