Fix: long-tapping a WebAPK in recents shows Chrome.

chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/ShellActivity.java

Index: chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/ShellActivity.java
diff --git a/chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/ShellActivity.java b/chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/ShellActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..068f8ad15152937422c161233d5bcb03ecebc027
--- /dev/null
+++ b/chrome/android/webapk/shell_apk/src/org/chromium/webapk/shell_apk/ShellActivity.java
@@ -0,0 +1,29 @@
+// 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.webapk.shell_apk;
+
+import android.app.Activity;
+import android.os.Build;
+import android.os.Bundle;
+
+/**
+ * WebAPK's activity which launches host browser and is shown in recents on L+.
+ */
+public class ShellActivity extends Activity {

[Yaron, 2017/03/29 14:07:33]

i think we need a better name for this. Perhaps something like
RecentsPlaceholderActivity

[Xi Han, 2017/03/29 15:16:43]

Done.

+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        assert Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP;

[Yaron, 2017/03/29 14:07:33]

This should only be called on L+? Then why the conditional below?

[Xi Han, 2017/03/29 15:16:43]

Removed. I though assert is used like DCHECK, isn't it?

+
+        LaunchWebApkHelper helper = new LaunchWebApkHelper();
+        if (!helper.launch(this)) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                finishAndRemoveTask();
+            } else {
+                finish();
+            }
+        }
+    }
+}