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

chrome/android/java/src/org/chromium/chrome/browser/VrActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/VrActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/VrActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/VrActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..1474f77e8d19f3ae2ae2765bfcf83ae6ee54d506
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/VrActivity.java
@@ -0,0 +1,73 @@
+// 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;
+
+import android.graphics.PixelFormat;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+
+import org.chromium.chrome.browser.init.AsyncInitializationActivity;
+import org.chromium.chrome.browser.vr_shell.VrShell;
+
+/**
+ * A subclass of AsyncInitializationActivity, used in Daydream VR mode.
+ * TODO(bshe): This activity needs to access the same set of tabs as ChromeTabbedActivity.
+ * See more detail in crbug.com/641038.
+ *
+ */
+public class VrActivity extends AsyncInitializationActivity {
+    private VrShell mVrShellView;
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mVrShellView.onResume();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mVrShellView.onPause();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        if (mVrShellView != null) {
+            mVrShellView.shutdown();
+            mVrShellView = null;
+        }
+    }
+
+    @Override
+    public void initializeCompositor() {
+        super.initializeCompositor();
+        mVrShellView.onNativeLibraryReady();
+    }
+
+    @Override
+    public void setContentView() {
+        setupVrModeWindowFlags();
+        addVrViews();
+    }
+
+    private void addVrViews() {
+        mVrShellView = new VrShell(this);
+        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
+                WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT,
+                WindowManager.LayoutParams.TYPE_APPLICATION, 0, PixelFormat.OPAQUE);
+        setContentView(mVrShellView, params);
+    }
+
+    private void setupVrModeWindowFlags() {
+        Window window = getWindow();
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+        window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+    }
+}