Initial CL for talking to the WebAPK server to generate WebAPK

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInstaller.java

+// Copyright 2016 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.webapps;
+
+import android.content.Context;
+
+import org.chromium.base.ContextUtils;
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.chrome.browser.ChromeApplication;
+
+/**
+ * Java counterpart to webapk_installer.h
+ * Contains functionality to install WebAPKs.
+ */
+public abstract class WebApkInstaller {
+    /**
+     * Installs a WebAPK.
+     * @param filePath File to install.
+     * @param packageName Package name to install WebAPK at.
+     * @return True if the install was started. A "true" return value does not guarantee that the
+     *         install succeeds.
+     */
+    public abstract boolean installAsync(String filePath, String packageName);
+
+    @CalledByNative
+    static boolean installAsyncFromNative(String filePath, String packageName) {
+        Context context = ContextUtils.getApplicationContext();
+        WebApkInstaller apkInstaller = ((ChromeApplication) context).createWebApkInstaller();
+        if (apkInstaller == null) {
+            return false;
+        }
+        apkInstaller.installAsync(filePath, packageName);
+        return true;
+    }
+}