[DeviceService] Mojofy left screen orientation IPC messages.

content/browser/screen_orientation/screen_orientation_listener_android.cc

Index: content/browser/screen_orientation/screen_orientation_listener_android.cc
diff --git a/content/browser/screen_orientation/screen_orientation_listener_android.cc b/content/browser/screen_orientation/screen_orientation_listener_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..850e89e5b9fb509d99fb202917a7658d8337794a
--- /dev/null
+++ b/content/browser/screen_orientation/screen_orientation_listener_android.cc
@@ -0,0 +1,46 @@
+// 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_listener_android.h"
+
+#include "base/message_loop/message_loop.h"
+#include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
+#include "content/common/screen_orientation_messages.h"
+
+namespace content {
+
+ScreenOrientationListenerAndroid::ScreenOrientationListenerAndroid()
+    : BrowserMessageFilter(ScreenOrientationMsgStart),
+      BrowserAssociatedInterface<device::mojom::ScreenOrientationListener>(
+          this,
+          this),
+      listeners_count_(0) {}
+
+ScreenOrientationListenerAndroid::~ScreenOrientationListenerAndroid() {
+  DCHECK(base::MessageLoopForIO::IsCurrent());
+  if (listeners_count_ > 0)
+    ScreenOrientationDelegateAndroid::StopAccurateListening();
+}
+
+bool ScreenOrientationListenerAndroid::OnMessageReceived(
+    const IPC::Message& message) {
+  return false;
+}
+
+void ScreenOrientationListenerAndroid::Start() {
+  DCHECK(base::MessageLoopForIO::IsCurrent());
+  ++listeners_count_;
+  if (listeners_count_ == 1)
+    ScreenOrientationDelegateAndroid::StartAccurateListening();
+}
+
+void ScreenOrientationListenerAndroid::Stop() {
+  DCHECK(base::MessageLoopForIO::IsCurrent());
+  DCHECK(listeners_count_ > 0);
+  --listeners_count_;
+  if (listeners_count_ == 0)
+    ScreenOrientationDelegateAndroid::StopAccurateListening();
+}
+
+}  // namespace content