Implement ScreenOrientationProvider for Chrome Android.

content/browser/screen_orientation/screen_orientation_provider_android.cc

+// Copyright 2014 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.
+
+#include "content/browser/screen_orientation/screen_orientation_dispatcher_host.h"
+#include "content/browser/screen_orientation/screen_orientation_provider_android.h"
+#include "jni/ScreenOrientationProvider_jni.h"
+
+namespace content {
+
+// static
+bool ScreenOrientationProviderAndroid::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void ScreenOrientationProviderAndroid::LockOrientation(
+    blink::WebScreenOrientations orientations) {
+  if (j_screen_orientation_provider_.is_null()) {
+    j_screen_orientation_provider_.Reset(Java_ScreenOrientationProvider_create(
+        base::android::AttachCurrentThread()));
+  }
+
+  Java_ScreenOrientationProvider_lockOrientation(
+      base::android::AttachCurrentThread(),
+      j_screen_orientation_provider_.obj(), orientations);
+}
+
+void ScreenOrientationProviderAndroid::UnlockOrientation() {
+  // j_screen_orientation_provider_ is set when locking. If the screen
+  // orientation was not locked, unlocking should be a no-op.
+  if (j_screen_orientation_provider_.is_null())
+    return;
+
+  Java_ScreenOrientationProvider_unlockOrientation(
+      base::android::AttachCurrentThread(),
+      j_screen_orientation_provider_.obj());
+}
+
+// static
+ScreenOrientationProvider* ScreenOrientationDispatcherHost::CreateProvider() {
+  return new ScreenOrientationProviderAndroid();
+}
+
+} // namespace content