Upstream FirstRunActivity and friends.

chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunPagerAdapter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunPagerAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunPagerAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunPagerAdapter.java
new file mode 100644
index 0000000000000000000000000000000000000000..a926aa31a3f286c13e424854ea2408a2be6b92b9
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/firstrun/FirstRunPagerAdapter.java
@@ -0,0 +1,76 @@
+// 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.firstrun;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.os.Bundle;
+import android.support.v13.app.FragmentStatePagerAdapter;
+
+import java.util.List;
+import java.util.concurrent.Callable;
+
+/**
+ * Adapter used to provide First Run pages to the FirstRunActivity ViewPager.
+ */
+class FirstRunPagerAdapter extends FragmentStatePagerAdapter {
+    private final List<Callable<FirstRunPage>> mPages;
+    private final Bundle mFreProperties;
+
+    private boolean mStopAtTheFirstPage;
+
+    public FirstRunPagerAdapter(FragmentManager fragmentManager,
+            List<Callable<FirstRunPage>> pages, Bundle freProperties) {
+        super(fragmentManager);
+        assert pages != null;
+        assert pages.size() > 0;
+        assert freProperties != null;
+        mPages = pages;
+        mFreProperties = freProperties;
+    }
+
+    /**
+     * Controls progression beyond the first page.
+     * @param stop True if no progression beyond the first page is allowed.
+     */
+    void setStopAtTheFirstPage(boolean stop) {
+        if (stop != mStopAtTheFirstPage) {
+            mStopAtTheFirstPage = stop;
+            notifyDataSetChanged();
+        }
+    }
+
+    @Override
+    public Fragment getItem(int position) {
+        assert position >= 0 && position < mPages.size();
+        FirstRunPage result = null;
+        try {
+            result = mPages.get(position).call();
+        } catch (Exception e) {
+            // We can always return null and it will be properly handled at the caller level.
+        }
+        if (result == null) return null;
+
+        Bundle props = new Bundle();
+        props.putAll(mFreProperties);
+        FirstRunPage.addProperties(props, position, getCount() - 1);
+        result.setArguments(props);
+
+        return result;
+    }
+
+    @Override
+    public int getCount() {
+        if (mStopAtTheFirstPage) return 1;
+        return mPages.size();
+    }
+
+    @Override
+    public int getItemPosition(Object object) {
+        // We do not keep track of constructed objects, but we want the pages to be recreated
+        // on notifyDataSetChanged. Hence, tell the view that it needs to refresh the objects.
+        return POSITION_NONE;
+    }
+}