Android: decouple mojo shell from the network service.

shell/android/apk/src/org/chromium/mojo_shell_apk/FileHelper.java

 // 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.mojo_shell_apk;
 
 import android.content.Context;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
 /**
  * Helper methods for file extraction from APK assets and zip archives.
  */
 class FileHelper {
     // Size of the buffer used in streaming file operations.
     private static final int BUFFER_SIZE = 1024 * 1024;
     // Prefix used when naming temporary files.
     private static final String TEMP_FILE_PREFIX = "temp-";
 
-    static File extractFromAssets(Context context, String assetName, File outputDirectory)
-            throws IOException, FileNotFoundException {
-        // Make the original filename part of the temp file name.
-        // TODO(ppi): do we need to sanitize the suffix?
-        String suffix = "-" + assetName;
-        File outputFile = File.createTempFile(TEMP_FILE_PREFIX, suffix, outputDirectory);
+    static File extractFromAssets(Context context, String assetName, File outputDirectory,
+            boolean useTempFile) throws IOException, FileNotFoundException {
+        File outputFile;
+        if (useTempFile) {
+            // Make the original filename part of the temp file name.
+            // TODO(ppi): do we need to sanitize the suffix?
+            String suffix = "-" + assetName;
+            outputFile = File.createTempFile(TEMP_FILE_PREFIX, suffix, outputDirectory);
+        } else {
+            outputFile = new File(outputDirectory, assetName);
+        }
+
         BufferedInputStream inputStream = new BufferedInputStream(
                 context.getAssets().open(assetName));
         writeStreamToFile(inputStream, outputFile);
         inputStream.close();
         return outputFile;
     }
 
     /**
      * Extracts the file of the given extension from the archive. Throws FileNotFoundException if no
      * matching file is found.
@@ skipping 35 matching lines @@
             throws IOException {
         byte[] buffer = new byte[BUFFER_SIZE];
         OutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
         int read;
         while ((read = inputStream.read(buffer, 0, BUFFER_SIZE)) > 0) {
             outputStream.write(buffer, 0, read);
         }
         outputStream.close();
     }
 }