Upstream: Launch WebApkActivity from WebAPK.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..2cd5ea50d829ef8efec3498d910f8cdb120fc8a4
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
@@ -0,0 +1,42 @@
+// Copyright 2016 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.content.Intent;
+
+import org.chromium.chrome.browser.ShortcutHelper;
+import org.chromium.content_public.browser.LoadUrlParams;
+import org.chromium.ui.base.PageTransition;
+
+/**
+ * An Activity is designed for WebAPKs (native Android apps) and displays a webapp in a nearly
+ * UI-less Chrome.
+ */
+public class WebApkActivity extends WebappActivity {
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        // We could bring a WebAPK hosted WebappActivity to foreground and navigate it to a
+        // different URL. For example, WebAPK "foo" is launched and navigates to
+        // "www.foo.com/foo". In Chrome, user clicks a link "www.foo.com/bar" in Google search
+        // results. After clicking the link, WebAPK "foo" is brought to foreground, and
+        // loads the page of "www.foo.com/bar" at the same time.
+        // The extra {@link ShortcutHelper.EXTRA_URL} provides the URL that the WebAPK will
+        // navigate to.
+        String overrideUrl = intent.getStringExtra(ShortcutHelper.EXTRA_URL);
+        if (overrideUrl != null && isInitialized()
+                && !overrideUrl.equals(getActivityTab().getUrl())) {
+            getActivityTab().loadUrl(
+                    new LoadUrlParams(overrideUrl, PageTransition.AUTO_TOPLEVEL));
+        }
+    }
+
+    @Override
+    protected void initializeSplashScreenWidgets(final int backgroundColor) {
+        // TODO(hanxi): Removes this function and use {@link WebApkActivity}'s implementation
+        // when WebAPKs are registered in WebappRegistry.
+        initializeSplashScreenWidgets(backgroundColor, null);
+    }
+}