Introduce ChromeVR to Chrome on Android (behind a build flag)

chrome/android/java/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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. -->
 
 <!--
 Note: This is a jinja2 template, processed at build time into the final manifest.
 
 Blocks denoted with { % block some_name % }foo{ % endblock % } can be overridden
 by a child template that "extends" this file.
@@ skipping 34 matching lines @@
     <uses-permission android:name="android.permission.NFC"/>
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS"/>
     <uses-permission android:name="android.permission.READ_SYNC_STATS"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
     <uses-permission android:name="android.permission.USE_CREDENTIALS"/>
     <uses-permission android:name="android.permission.VIBRATE"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS"/>
+    {% set enable_vr_shell = enable_vr_shell|default(0) %}
+    {% if enable_vr_shell == "true" %}
+    <!-- Required to read the paired viewer's distortion parameters. -->
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    {% endif %}
 
     <permission android:name="{{ manifest_package }}.permission.CHILD_SERVICE" android:protectionLevel="signature" />
     <permission android:name="{{ manifest_package }}.permission.READ_WRITE_BOOKMARK_FOLDERS" android:protectionLevel="signatureOrSystem" />
     <permission android:name="{{ manifest_package }}.TOS_ACKED" android:protectionLevel="signatureOrSystem" />
     <!-- Only chrome can receive the messages and registration result -->
     <permission android:name="{{ manifest_package }}.permission.C2D_MESSAGE"
         android:protectionLevel="signature" />
     <permission android:name="{{ manifest_package }}.permission.DEBUG"
                 android:label="Debug web pages"
                 android:permissionGroup="android.permission-group.DEVELOPMENT_TOOLS"
@@ skipping 84 matching lines @@
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.LAUNCHER" />
                 <category android:name="android.intent.category.BROWSABLE" />
                 <category android:name="android.intent.category.APP_BROWSER" />
                 <category android:name="android.intent.category.NOTIFICATION_PREFERENCES" />
                 {% if channel in ['dev', 'canary', 'default'] %}
                 <category android:name="android.intent.category.MULTIWINDOW_LAUNCHER" />
                 {% endif %}
-                {% set enable_vr_shell = enable_vr_shell|default(0) %}
-                {% if enable_vr_shell == "true" %}
-                <!-- Show icon in Daydream app launcher. -->
-                <category android:name="com.google.intent.category.DAYDREAM" />
-                {% endif %}
             </intent-filter>
             <!-- Matches the common case of intents with no MIME type.
                  Make sure to keep in sync with the next filter.  -->
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.BROWSABLE" />
                 {% if channel in ['stable', 'default'] %}<data android:scheme="googlechrome" />{% endif %}
                 <data android:scheme="http" />
                 <data android:scheme="https" />
@@ skipping 164 matching lines @@
 
         <!-- ChromeTabbedActivity related -->
         <activity android:name="org.chromium.chrome.browser.ChromeTabbedActivity"
              android:theme="@style/TabbedModeTheme"
              android:exported="false"
              android:windowSoftInputMode="adjustResize"
              android:launchMode="singleTask"
              android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc|screenLayout|smallestScreenSize"
              android:hardwareAccelerated="false">
         </activity>
+        {% if enable_vr_shell == "true" %}
+        <activity android:name="org.chromium.chrome.browser.VrActivity"
+             android:theme="@style/MainTheme"
+             android:windowSoftInputMode="stateAlwaysHidden"
+             android:launchMode="singleTask"
+             android:screenOrientation="landscape"
+             android:hardwareAccelerated="false"
+             android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+                <!-- Show icon in Daydream app launcher. -->
+                <category android:name="com.google.intent.category.DAYDREAM" />
+           </intent-filter>
+        </activity>
+        {% endif %}
         <activity android:name="org.chromium.chrome.browser.ChromeTabbedActivity2"
              android:theme="@style/TabbedModeTheme"
              android:exported="false"
              android:windowSoftInputMode="adjustResize"
              android:taskAffinity="{{ manifest_package }}.ChromeTabbedActivity2"
              android:launchMode="singleTask"
              android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc|screenLayout|smallestScreenSize"
              android:hardwareAccelerated="false">
         </activity>
         <activity android:name="org.chromium.chrome.browser.multiwindow.MultiInstanceChromeTabbedActivity"
@@ skipping 552 matching lines @@
              choose the first MediaRouteController that can play it, so the order of the list can be important.
              The most specific MediaRouteControllers should be listed first, followed by more generic ones.
              The downstream manifest replaces this block, and hence replaces the list of media route
              controllers with its own list. -->
         <meta-data android:name="org.chromium.content.browser.REMOTE_MEDIA_PLAYERS"
             android:value="org.chromium.chrome.browser.media.remote.DefaultMediaRouteController"/>
 
         {% endblock %}
     </application>
 </manifest>