[Offline pages] Clean up of device conditions related code

chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowDeviceConditions.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowDeviceConditions.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowDeviceConditions.java b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowDeviceConditions.java
new file mode 100644
index 0000000000000000000000000000000000000000..0862b5562458ba7a14bdf98f63b47ee485af291f
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/ShadowDeviceConditions.java
@@ -0,0 +1,42 @@
+// Copyright 2017 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.offlinepages;
+
+import android.content.Context;
+
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+
+/** Custom shadow for the OfflinePageUtils. */
+@Implements(DeviceConditions.class)
+public class ShadowDeviceConditions {
+    /** Device conditions for testing. */
+    private static DeviceConditions sDeviceConditions = new DeviceConditions();
+
+    /** Sets device conditions that will be used in test. */
+    public static void setCurrentConditions(DeviceConditions deviceConditions) {
+        sDeviceConditions = deviceConditions;
+    }
+
+    @Implementation
+    public static DeviceConditions getCurrentConditions(Context context) {
+        return sDeviceConditions;
+    }
+
+    @Implementation
+    public static boolean isPowerConnected(Context context) {
+        return sDeviceConditions.isPowerConnected();
+    }
+
+    @Implementation
+    public static int getBatteryPercentage(Context context) {
+        return sDeviceConditions.getBatteryPercentage();
+    }
+
+    @Implementation
+    public static int getNetConnectionType(Context context) {
+        return sDeviceConditions.getNetConnectionType();
+    }
+}