Support setting mouse cursor icon in Android N.

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

 // 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.content_shell_apk;
 
 import static org.chromium.base.test.util.ScalableTimeout.scaleTimeout;
 
 import android.annotation.TargetApi;
 import android.app.Activity;
@@ skipping 98 matching lines @@
                 }
                 if (TextUtils.isEmpty(shell.getContentViewCore().getWebContents().getUrl())) {
                     updateFailureReason("Shell's URL is empty or null.");
                     return false;
                 }
                 return true;
             }
         }, WAIT_FOR_ACTIVE_SHELL_LOADING_TIMEOUT, CriteriaHelper.DEFAULT_POLLING_INTERVAL);
     }
 
+    void setCursorUpdateCallback(Runnable callback) {
+        mCallback.getActivityForTestCommon()
+                .getActiveShell()

[boliu, 2017/05/31 16:30:03]

activity accessors should happen on ui thread. use
mCallback.runOnUiThreadForTestCommon

[jaebaek, 2017/06/01 06:20:56]

Ok, I will update it in that way, but have a question.
Why do other methods call "getActiveShell()" directly?

[boliu, 2017/06/01 16:14:50]

they are probably also unsafe, in theory

+                .getViewAndroidDelegate()
+                .setOnCursorUpdate(callback);
+    }
+
     ContentViewCore getContentViewCore() {
         return mCallback.getActivityForTestCommon().getActiveShell().getContentViewCore();
     }
 
     WebContents getWebContents() {
         return mCallback.getActivityForTestCommon().getActiveShell().getWebContents();
     }
 
     void loadUrl(final NavigationController navigationController,
             TestCallbackHelperContainer callbackHelperContainer, final LoadUrlParams params)
@@ skipping 62 matching lines @@
         Instrumentation getInstrumentationForTestCommon();
         T launchActivityWithIntentForTestCommon(Intent t);
         T getActivityForTestCommon();
         void runOnUiThreadForTestCommon(Runnable runnable) throws Throwable;
         ContentViewCore getContentViewCoreForTestCommon();
         ContentShellActivity launchContentShellWithUrlForTestCommon(String url);
         WebContents getWebContentsForTestCommon();
         void waitForActiveShellToBeDoneLoadingForTestCommon();
     }
 }