Implement Device Orientation using shared memory in content/renderer.

content/browser/renderer_host/device_orientation_browser_message_filter.cc

Index: content/browser/renderer_host/device_orientation_browser_message_filter.cc
diff --git a/content/browser/renderer_host/device_orientation_browser_message_filter.cc b/content/browser/renderer_host/device_orientation_browser_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..585958c85aa7553eacbcde23835ec1ffed784d56
--- /dev/null
+++ b/content/browser/renderer_host/device_orientation_browser_message_filter.cc
@@ -0,0 +1,69 @@
+// 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/renderer_host/device_orientation_browser_message_filter.h"
+
+#include "content/browser/device_orientation/device_motion_service.h"
+#include "content/common/device_orientation_messages.h"
+
+namespace content {
+
+DeviceOrientationBrowserMessageFilter::DeviceOrientationBrowserMessageFilter()
+    : is_started_(false) {
+}
+
+DeviceOrientationBrowserMessageFilter::

[Michael van Ouwerkerk, 2013/07/26 15:14:33]

You can shorten this class name to DeviceOrientationMessageFilter if it is the
only filter for device orientation.

[timvolodine, 2013/07/30 15:14:08]

yeah, there is already a message filter in the browser/device_orientation/
directory, which I'll remove once everything has been ported to the new
approach.

+~DeviceOrientationBrowserMessageFilter() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (is_started_) {
+    // TODO(timvolodine): insert a proper call to DeviceSensorService here,
+    // similar to DeviceMotionService::GetInstance()->RemoveConsumer();
+  }
+}
+
+bool DeviceOrientationBrowserMessageFilter::OnMessageReceived(
+    const IPC::Message& message,
+    bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(DeviceOrientationBrowserMessageFilter,
+                           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 DeviceOrientationBrowserMessageFilter::OnDeviceOrientationStartPolling() {
+  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 DeviceOrientationBrowserMessageFilter::OnDeviceOrientationStopPolling() {
+  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 DeviceOrientationBrowserMessageFilter::DidStartDeviceOrientationPolling() {
+  // TODO(timvolodine): insert a proper call to DeviceSensorService here,
+  // similar to
+  // DeviceMotionService::GetInstance()->GetSharedMemoryHandleForProcess();
+  Send(new DeviceOrientationMsg_DidStartPolling(
+      DeviceOrientationService::GetInstance()->GetSharedMemoryHandleForProcess(
+          PeerHandle())));
+}
+
+}  // namespace content