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

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeVrActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeVrActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeVrActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..be403eea9d5b719308c1d83b5138f6bdc3b7a404
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeVrActivity.java
@@ -0,0 +1,77 @@
+// 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.graphics.SurfaceTexture;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+
+import org.chromium.chrome.browser.vr_shell.VrShell;
+
+/**
+ * A subclass of ChromeTabbedActivity, used in Daydream VR mode.
+ */
+public class ChromeVrActivity extends ChromeTabbedActivity {
+    private VrShell mVrShellView;
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mVrShellView.onResume();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mVrShellView.onPause();
+    }
+
+    @Override
+    public void onDestroyInternal() {
+        super.onDestroyInternal();
+        if (mVrShellView != null) {
+            mVrShellView.shutdown();
+            mVrShellView = null;
+        }
+    }
+
+    @Override
+    public void initializeCompositor() {
+        super.initializeCompositor();
+        mVrShellView.onNativeLibraryReady();
+    }
+
+    @Override
+    public void postInflationStartup() {
+        super.postInflationStartup();
+        addVrViews();
+        setupVrModeWindowFlags();
+    }
+
+    public void replaceCompositorSurface(SurfaceTexture surfaceTexture) {
+        if (getCompositorViewHolder() != null) {
+            getCompositorViewHolder().replaceCompositorSurface(surfaceTexture);
+        }
+    }
+
+    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);
+        this.addContentView(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);
+    }
+}