Initial tests for ReaderModeManager

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
index 98638061bee666076974889a6cf344e0bab4c191..f7b81e33a5ac0d72a474a8eaf8448b36811abc9c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
@@ -1191,6 +1191,13 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
     }
 
     /**
+     * @return The {@code ReaderModeManager} or {@code null} if none;
+     */
+    public ReaderModeManager getReaderModeManager() {
+        return mReaderModeManager;
+    }
+
+    /**
      * Create a full-screen manager to be used by this activity.
      * @param controlContainer The control container that will be controlled by the full-screen
      *                         manager.