Implement the content/renderer and content/browser part of the Device Motion API.

content/browser/renderer_host/device_motion_browser_message_filter.cc

Index: content/browser/renderer_host/device_motion_browser_message_filter.cc
diff --git a/content/browser/renderer_host/device_motion_browser_message_filter.cc b/content/browser/renderer_host/device_motion_browser_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5297040efd8f70ac29371ce1bc076d34d9093c2b
--- /dev/null
+++ b/content/browser/renderer_host/device_motion_browser_message_filter.cc
@@ -0,0 +1,60 @@
+// Copyright (c) 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/renderer_host/device_motion_browser_message_filter.h"
+
+#include "content/browser/device_orientation/device_motion_service.h"
+#include "content/common/device_motion_messages.h"
+
+namespace content {
+
+DeviceMotionBrowserMessageFilter::DeviceMotionBrowserMessageFilter()
+    : is_started_(false) {
+}
+
+DeviceMotionBrowserMessageFilter::~DeviceMotionBrowserMessageFilter() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (is_started_)
+    DeviceMotionService::GetInstance()->RemoveConsumer();
+}
+
+bool DeviceMotionBrowserMessageFilter::OnMessageReceived(
+    const IPC::Message& message,
+    bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(DeviceMotionBrowserMessageFilter,
+                           message,
+                           *message_was_ok)
+    IPC_MESSAGE_HANDLER(DeviceMotionHostMsg_StartPolling,
+                        OnDeviceMotionStartPolling)
+    IPC_MESSAGE_HANDLER(DeviceMotionHostMsg_StopPolling,
+                        OnDeviceMotionStopPolling)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+  return handled;
+}
+
+void DeviceMotionBrowserMessageFilter::OnDeviceMotionStartPolling(
+    base::SharedMemoryHandle* renderer_handle) {
+  DeviceMotionService* service = DeviceMotionService::GetInstance();
+  if (!is_started_) {
+    is_started_ = true;
+    service->AddConsumer();
+    *renderer_handle = service->GetSharedMemoryHandleForProcess(peer_handle());
+  } else {
+    // Currently we only expect the renderer to tell us once to start.
+    NOTREACHED();
+  }
+}
+
+void DeviceMotionBrowserMessageFilter::OnDeviceMotionStopPolling() {
+  if (is_started_) {
+    is_started_ = false;
+    DeviceMotionService::GetInstance()->RemoveConsumer();
+  } else {
+    NOTREACHED();
+  }
+}
+
+}  // namespace content