Migrate WebVR Cardboard implementation to GVR

device/vr/android/java/src/org/chromium/device/vr/GvrDeviceProvider.java

+// 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.device.vr;
+
+import android.content.Context;
+
+import com.google.vr.ndk.base.GvrLayout;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * This is the implementation of the C++ counterpart GvrDeviceProvider.
+ */
+@JNINamespace("device")
+class GvrDeviceProvider {
+    private static final String TAG = "GvrDeviceProvider";
+    private final GvrLayout mLayout;
+    private Thread mGvrInitThread;
+
+    private GvrDeviceProvider(Context context) {
+        mLayout = new GvrLayout(context);
+
+        // Initialize the GVR API on a separate thread to avoid strict mode
+        // violations. Note that this doesn't fix the underlying issue of
+        // blocking on disk reads here.
+        mGvrInitThread = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                mLayout.getGvrApi();
+            }
+        });
+        mGvrInitThread.start();
+    }
+
+    @CalledByNative
+    private static GvrDeviceProvider create(Context context) {
+        return new GvrDeviceProvider(context);
+    }
+
+    @CalledByNative
+    private long getNativeContext() {
+        try {
+            mGvrInitThread.join();
+        } catch (Exception ex) {
+        }
+        return mLayout.getGvrApi().getNativeGvrContext();
+    }
+
+    @CalledByNative
+    private void shutdown() {
+        mLayout.shutdown();
+    }
+}