Fix incremental_install breaking after clearing app data.

build/android/incremental_install/java/org/chromium/incrementalinstall/ClassLoaderPatcher.java

 // 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.incrementalinstall;
 
 import android.content.Context;
 import android.os.Build;
 import android.util.Log;
 
@@ skipping 98 matching lines @@
         addNativeLibrarySearchPath(libDir);
     }
 
     /**
      * Primary process: Copies native libraries into the app's data directory
      * Other processes: Waits for primary process to finish copying.
      */
     private File prepareNativeLibsAndroidM(File libDir) throws IOException {
         File localLibsDir = new File(mAppFilesSubDir, "lib");
         File copyLibsLockFile = new File(mAppFilesSubDir, "libcopy.lock");
-        // Due to a new SELinux policy, all libs must be copied into the app's
-        // data directory first.
-        // https://code.google.com/p/android/issues/detail?id=79480

[pkotwicz, 2015/10/05 19:39:39]

Did you mean to remove this comment?

[agrieve, 2015/10/05 19:45:35]

Done.

         if (mIsPrimaryProcess) {
+            // Primary process: Copies native libraries into the app's data directory.
+            ensureAppFilesSubDirExists();
             LockFile lockFile = LockFile.acquireRuntimeLock(copyLibsLockFile);
             if (lockFile == null) {
                 LockFile.waitForRuntimeLock(copyLibsLockFile, 10 * 1000);
             } else {
                 try {
-                    ensureAppFilesSubDirExists();
                     localLibsDir.mkdir();
                     localLibsDir.setReadable(true, false);
                     localLibsDir.setExecutable(true, false);
                     copyChangedFiles(libDir, localLibsDir);
                 } finally {
                     lockFile.release();
                 }
             }
         } else {
             // TODO: Work around this issue by using APK splits to install each dex / lib.
@@ skipping 84 matching lines @@
         Object[] entries = new Object[files.length];
         File emptyDir = new File("");
         for (int i = 0; i < files.length; ++i) {
             File file = files[i];
             Object dexFile = Reflect.invokeMethod(clazz, "loadDexFile", file, optimizedDirectory);
             entries[i] = Reflect.newInstance(entryClazz, emptyDir, false, file, dexFile);
         }
         return entries;
     }
 }