Let AppBannerManager really create and manage banners

chrome/android/java/src/org/chromium/chrome/browser/banners/AppDetailsDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/banners/AppDetailsDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/banners/AppDetailsDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/banners/AppDetailsDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..833516c322074a8c04250fd7c8b920e25df63780
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/banners/AppDetailsDelegate.java
@@ -0,0 +1,75 @@
+// Copyright 2014 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.banners;
+
+import android.content.Context;
+import android.os.AsyncTask;
+
+/**
+ * Fetches data about the given app.
+ */
+public abstract class AppDetailsDelegate {
+    /**
+     * Class to inform when the app's details have been retrieved.
+     */
+    interface Observer {
+        /**
+         * Called when the task has finished.
+         * @param data Data about the requested package.  Will be null if retrieval failed.
+         */
+        public void onAppDetailsRetrieved(AppData data);
+    }
+
+    /**
+     * Runs a background task to retrieve details about an app.
+     */
+    class DetailsTask extends AsyncTask<Void, Void, Boolean> {
+        final Observer mObserver;
+        final AppData mData;
+        final int mIconSize;
+
+        DetailsTask(Observer observer, Context context, String url, String packageName) {
+            mObserver = observer;
+            mData = new AppData(url, packageName);
+            mIconSize = AppBannerView.getIconSize(context);
+        }
+
+        @Override
+        protected Boolean doInBackground(Void... args) {
+            return getAppDetails(mData, mIconSize);
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            mObserver.onAppDetailsRetrieved(result ? mData : null);
+        }
+    }
+
+    /**
+     * Creates a task to retrieve data about the given app.
+     * @param observer    Observer to inform about the task's completion.
+     * @param context     Context to grab resources from.
+     * @param url         URL of the page that is requesting a banner.
+     * @param packageName Package name for the app being displayed.
+     * @return
+     */
+    DetailsTask createTask(Observer observer, Context context, String url, String packageName) {
+        return new DetailsTask(observer, context, url, packageName);
+    }
+
+    /**
+     * Retrieves information about the given package.
+     * @param data        Data about the app will be placed in this class.  Must already contain
+     *                    the name of the package to retrieve data for.
+     * @param iconSize    Size of the icon to retrieve.
+     * @return            True if the data was retrieved successfully.
+     */
+    protected abstract boolean getAppDetails(AppData data, int iconSize);
+
+    /**
+     * Destroy the delegate, cleaning up any open hooks.
+     */
+    public abstract void destroy();
+}