Make ViewRoot the top of the ViewAndroid tree

content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/ChromiumLinkerTestActivity.java

Index: content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/ChromiumLinkerTestActivity.java
diff --git a/content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/ChromiumLinkerTestActivity.java b/content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/ChromiumLinkerTestActivity.java
index 46396eda086ac8954f5f8206d2ec0a57426081fc..7466ed954bd9d3b118b7fde9b837c9fe10de092f 100644
--- a/content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/ChromiumLinkerTestActivity.java
+++ b/content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/ChromiumLinkerTestActivity.java
@@ -25,6 +25,7 @@ import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content_shell.Shell;
 import org.chromium.content_shell.ShellManager;
 import org.chromium.ui.base.ActivityWindowAndroid;
+import org.chromium.ui.base.ViewRoot;
 
 /**
  * Test activity used for verifying the different configuration options for the ContentLinker.
@@ -49,6 +50,7 @@ public class ChromiumLinkerTestActivity extends Activity {
     private static final String USE_LEGACY_LINKER = "--use-linker=legacy";
 
     private ShellManager mShellManager;
+    private ViewRoot mViewRoot;
     private ActivityWindowAndroid mWindowAndroid;
 
     @SuppressFBWarnings("DMI_HARDCODED_ABSOLUTE_FILENAME")
@@ -134,7 +136,8 @@ public class ChromiumLinkerTestActivity extends Activity {
         View view = inflater.inflate(R.layout.test_activity, null);
         mShellManager = (ShellManager) view.findViewById(R.id.shell_container);
         mWindowAndroid = new ActivityWindowAndroid(this);
-        mShellManager.setWindow(mWindowAndroid);
+        mViewRoot = ViewRoot.create(mWindowAndroid);

[boliu, 2017/02/13 22:58:08]

this is an existing bug that the windowandroid here is never destroyed, but
should perhaps to find a place to destroy both window and viewroot?

[Jinsuk Kim, 2017/02/14 05:09:59]

Done. Added onDestroy() for that.

+        mShellManager.setViewRoot(mViewRoot);
 
         mShellManager.setStartupUrl("about:blank");