Support setting mouse cursor icon in Android N.

content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java

Index: content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java
diff --git a/content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java b/content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java
index ae8b821415b518120b4e09df8b475dde7b93a0dc..739cd34e2ffee30c97b366f6b8a1febfce6456c7 100644
--- a/content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java
+++ b/content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java
@@ -68,6 +68,13 @@ public class ContentShellTestBase extends BaseActivityInstrumentationTestCase<Co
     }
 
     /**
+     * @param callback it will be called when mouse cursor is updated
+     */
+    public void setCursorUpdateCallback(Runnable callback) {
+        mDelegate.setCursorUpdateCallback(callback);
+    }
+
+    /**
      * Returns the current ContentViewCore or null if there is no ContentView.
      */
     public ContentViewCore getContentViewCore() {