Redirects _blank and window.open() off-origin navigation from PWA to CCT.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappTabDelegate.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.chrome.browser.webapps;
+
+import android.net.Uri;
+import android.support.customtabs.CustomTabsIntent;
+
+import org.chromium.chrome.browser.IntentHandler;
+import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.chrome.browser.tab.TabIdManager;
+import org.chromium.chrome.browser.tabmodel.AsyncTabParamsManager;
+import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
+import org.chromium.chrome.browser.tabmodel.document.AsyncTabCreationParams;
+import org.chromium.chrome.browser.tabmodel.document.TabDelegate;
+
+/**
+ * Asynchronously creates Tabs for navigation originating from an installed PWA.
+ *
+ * This is the same as the parent class with exception of opening a Custom Tab for
+ * {@code _blank} links and {@code window.open(url)} calls instead of creating a new tab in Chrome.
+ */
+public class WebappTabDelegate extends TabDelegate {
+    private final WebappActivity mActivity;
+
+    public WebappTabDelegate(WebappActivity activity, boolean incognito) {
+        super(incognito);
+        this.mActivity = activity;
+    }
+
+    @Override
+    public void createNewTab(AsyncTabCreationParams asyncParams, TabLaunchType type, int parentId) {
+        int assignedTabId = TabIdManager.getInstance().generateValidId(Tab.INVALID_TAB_ID);
+        AsyncTabParamsManager.add(assignedTabId, asyncParams);
+
+        CustomTabsIntent customTabIntent =
+                new CustomTabsIntent.Builder().setShowTitle(true).build();
+
+        customTabIntent.intent.setPackage(mActivity.getPackageName());
+        IntentHandler.addTrustedIntentExtras(customTabIntent.intent);

[Yusuf, 2017/06/15 16:15:56]

this is conditioned on
ExternalNavigationDelegateImpl.willChromeHandleIntent(intent, true). and based
on that condition it does set the package name too. So if you are still needing
to set package separately that tells me the condition above fails for some
reason.

If things are working for you, feel free to just remove this line actually (as I
think in the current form it is a no-op based on your findings). But it does
make me pause a bit that willChromeHandleIntent return false here. I leave that
to you to dig deeper or not.

[piotrs, 2017/06/15 23:28:21]

It doesn't resolve to a single Chrome instance, as (on my test device) there are
multiple options to handle CCT (Chrome, Chromium, Clankium). I think this is
WAI, but I want to pin this intent to particular implementation for the reasons
mentioned earlier.

+        addAsyncTabExtras(asyncParams, parentId, true, assignedTabId, customTabIntent.intent);
+        customTabIntent.launchUrl(mActivity, Uri.parse(asyncParams.getLoadUrlParams().getUrl()));
+    }
+}