📺 Move fullscreen web content to a new Activity.

chrome/android/java/AndroidManifest.xml

Index: chrome/android/java/AndroidManifest.xml
diff --git a/chrome/android/java/AndroidManifest.xml b/chrome/android/java/AndroidManifest.xml
index 167e290c78eb62e81ef3fc573f500a1bf82e6760..f3c9306fb5bceae07d50798d93bdc3a9bb78b7ea 100644
--- a/chrome/android/java/AndroidManifest.xml
+++ b/chrome/android/java/AndroidManifest.xml
@@ -376,6 +376,15 @@ by a child template that "extends" this file.
                 <category android:name="com.google.intent.category.CARDBOARD" />
             </intent-filter>
         </activity>
+        
+        <activity android:name="org.chromium.chrome.browser.FullscreenWebContentsActivity"
+            android:theme="@style/TabbedModeTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc|screenLayout|smallestScreenSize"
+            android:exported="false"
+            {{ self.supports_video_persistence() }} >
+            <!-- TODO(peconn): Add a label. -->
+            <!-- TODO(peconn): Check the configChanges. -->
+        </activity>
 
         {% if enable_vr == "true" %}
         <!--