Land ContextUtils separately.

External dependencies need to be updated to call ContextUtils.initialize
before rest of the CL can be landed.

BUG=webrtc:7665

Review-Url: https://codereview.webrtc.org/2893933003
Cr-Commit-Position: refs/heads/master@{#18208}

webrtc/base/BUILD.gn

@@ -979,6 +979,7 @@ if (rtc_include_tests) {
 if (is_android) {
   android_library("base_java") {
     java_files = [
+      "java/src/org/webrtc/ContextUtils.java",
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",

webrtc/base/java/src/org/webrtc/ContextUtils.java

@@ -0,0 +1,42 @@
+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+import android.content.Context;
+
+/**
+ * Class for storing the application context and retrieving it in a static context. Similar to
+ * org.chromium.base.ContextUtils.
+ */
+public class ContextUtils {
+  private static Context applicationContext;
+
+  /**
+   * Stores the application context that will be returned by getApplicationContext. This is called
+   * by PeerConnectionFactory.initializeAndroidGlobals.
+   */
+  public static void initialize(Context applicationContext) {
+    if (ContextUtils.applicationContext != null) {
+      throw new RuntimeException("Multiple ContextUtils.initialize calls.");
+    }
+    if (applicationContext == null) {
+      throw new RuntimeException("Application context cannot be null for ContextUtils.initialize.");
+    }
+    ContextUtils.applicationContext = applicationContext;
+  }
+
+  /**
+   * Returns the stored application context.
+   */
+  public static Context getApplicationContext() {
+    return applicationContext;
+  }
+}