📺 Move fullscreen web content to a new Activity.

chrome/android/java/src/org/chromium/chrome/browser/multiwindow/MultiWindowUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/multiwindow/MultiWindowUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/multiwindow/MultiWindowUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/multiwindow/MultiWindowUtils.java
index 983145b737f6b0f70f0c9a98c415438ba83d1cc8..484cd251b749a1aac9c672af750bc3573b7681fd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/multiwindow/MultiWindowUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/multiwindow/MultiWindowUtils.java
@@ -23,6 +23,7 @@ import org.chromium.chrome.browser.ChromeTabbedActivity;
 import org.chromium.chrome.browser.ChromeTabbedActivity2;
 import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.document.ChromeLauncherActivity;
+import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.util.IntentUtils;
 
 import java.lang.ref.WeakReference;
@@ -44,8 +45,7 @@ public class MultiWindowUtils implements ActivityStateListener {
     //                    against N.
     public static final int FLAG_ACTIVITY_LAUNCH_ADJACENT = 0x00001000;
 
-    private static AtomicReference<MultiWindowUtils> sInstance =
-            new AtomicReference<MultiWindowUtils>();
+    private static AtomicReference<MultiWindowUtils> sInstance = new AtomicReference<>();
 
     // Used to keep track of whether ChromeTabbedActivity2 is running. A tri-state Boolean is
     // used in case both activities die in the background and MultiWindowUtils is recreated.
@@ -147,8 +147,7 @@ public class MultiWindowUtils implements ActivityStateListener {
     @Override
     public void onActivityStateChange(Activity activity, int newState) {
         if (newState == ActivityState.RESUMED && activity instanceof ChromeTabbedActivity) {
-            mLastResumedTabbedActivity =
-                    new WeakReference<ChromeTabbedActivity>((ChromeTabbedActivity) activity);
+            mLastResumedTabbedActivity = new WeakReference<>((ChromeTabbedActivity) activity);
         }
     }
 
@@ -275,6 +274,34 @@ public class MultiWindowUtils implements ActivityStateListener {
         return activityState == ActivityState.RESUMED || activityState == ActivityState.PAUSED;
     }
 
+    /**
+     * Moves a Tab to the other MultiWindow window.
+     * @param activity An Activity to use for context.
+     * @param tab The Tab to move.
+     */
+    public static void moveTabToOtherWindow(Activity activity, Tab tab) {
+        moveTabToActivity(
+                activity, tab, getInstance().getOpenInOtherWindowActivity(activity), false);
+    }
+
+    /**
+     * Moves a Tab to a specific Activity.
+     * @param activity An Activity to use for context.
+     * @param tab The Tab to move.
+     * @param targetActivity The Activity to move the Tab to.

[Bernhard Bauer, 2017/04/07 20:08:59]

It's the Activity Class, no? You could also wrap the class names in {@link […]}.

[PEConn, 2017/04/11 00:54:46]

Done.

+     * @param pendingFullscreen The fullscreen mode for the Tab to change to after being moved.
+     *                          Null if no change is required.
+     */
+    public static void moveTabToActivity(Activity activity, Tab tab,
+            Class<? extends Activity> targetActivity, @Nullable Boolean pendingFullscreen) {
+        if (targetActivity == null) return;
+
+        Intent intent = new Intent(activity, targetActivity);
+        MultiWindowUtils.setOpenInOtherWindowIntentExtras(intent, activity, targetActivity);
+        MultiWindowUtils.onMultiInstanceModeStarted();
+        tab.detachAndStartReparenting(intent, null, null, pendingFullscreen);
+    }
+
     @VisibleForTesting
     public Boolean getTabbedActivity2TaskRunning() {
         return mTabbedActivity2TaskRunning;