Implement Device Orientation using shared memory in content/renderer.

content/browser/device_orientation/device_orientation_message_filter.cc

Index: content/browser/device_orientation/device_orientation_message_filter.cc
diff --git a/content/browser/device_orientation/device_orientation_message_filter.cc b/content/browser/device_orientation/device_orientation_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cbb1e674c0e7459d9b61b9b2e06019d1f5993916
--- /dev/null
+++ b/content/browser/device_orientation/device_orientation_message_filter.cc
@@ -0,0 +1,70 @@
+// Copyright 2013 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/device_orientation/device_orientation_message_filter.h"
+
+#include "content/browser/device_orientation/device_motion_service.h"
+#include "content/common/device_orientation/device_orientation_messages.h"
+
+namespace content {
+
+DeviceOrientationMessageFilter::DeviceOrientationMessageFilter()
+    : is_started_(false) {
+}
+
+DeviceOrientationMessageFilter::~DeviceOrientationMessageFilter() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (is_started_) {
+    // TODO(timvolodine): insert a proper call to DeviceSensorService here,
+    // similar to DeviceMotionService::GetInstance()->RemoveConsumer();
+  }
+}
+
+bool DeviceOrientationMessageFilter::OnMessageReceived(
+    const IPC::Message& message,
+    bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(DeviceOrientationMessageFilter,
+                           message,
+                           *message_was_ok)
+    IPC_MESSAGE_HANDLER(DeviceOrientationHostMsg_StartPolling,
+                        OnDeviceOrientationStartPolling)
+    IPC_MESSAGE_HANDLER(DeviceOrientationHostMsg_StopPolling,
+                        OnDeviceOrientationStopPolling)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+  return handled;
+}
+
+void DeviceOrientationMessageFilter::OnDeviceOrientationStartPolling() {
+  NOTIMPLEMENTED();
+  DCHECK(!is_started_);
+  if (is_started_)
+    return;
+  is_started_ = true;
+  // TODO(timvolodine): insert a proper call to DeviceSensorService here,
+  // similar to DeviceMotionService::GetInstance()->AddConsumer();
+  DidStartDeviceOrientationPolling();
+}
+
+void DeviceOrientationMessageFilter::OnDeviceOrientationStopPolling() {
+  NOTIMPLEMENTED();
+  DCHECK(is_started_);
+  if (!is_started_)
+    return;
+  is_started_ = false;
+  // TODO(timvolodine): insert a proper call to DeviceSensorService here,
+  // similar to DeviceMotionService::GetInstance()->RemoveConsumer();
+}
+
+void DeviceOrientationMessageFilter::DidStartDeviceOrientationPolling() {
+  NOTIMPLEMENTED();
+  // TODO(timvolodine): insert a proper call to the generalized Service here,
+  // similar to
+  // Send(new DeviceOrientationMsg_DidStartPolling(
+  //     DeviceMotionService::GetInstance()->GetSharedMemoryHandleForProcess(
+  //        PeerHandle())));
+}
+
+}  // namespace content