chromeos: Add a stub implementation for SensorsSource.

chrome/browser/chromeos/dbus/sensors_client.cc

Index: chrome/browser/chromeos/dbus/sensors_client.cc
diff --git a/chrome/browser/chromeos/dbus/sensors_client.cc b/chrome/browser/chromeos/dbus/sensors_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d6b073c7bf1ae54782671c51a2103f0019166c4a
--- /dev/null
+++ b/chrome/browser/chromeos/dbus/sensors_client.cc
@@ -0,0 +1,99 @@
+// Copyright (c) 2011 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 "chrome/browser/chromeos/dbus/sensors_client.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "chrome/browser/chromeos/system/runtime_environment.h"
+#include "content/browser/browser_thread.h"
+#include "content/browser/sensors/sensors_provider.h"
+#include "dbus/bus.h"
+#include "dbus/message.h"
+#include "dbus/object_proxy.h"
+
+// TODO(cwolfe): Fix the DEPs so that these can be pulled in from
+//               "chromeos/dbus/service_constants.h".
+namespace chromeos {
+// Sensors service identifiers.
+const char kSensorsServiceName[] = "org.chromium.Sensors";
+const char kSensorsServicePath[] = "/org/chromium/Sensors";
+const char kSensorsServiceInterface[] = "org.chromium.Sensors";
+// Sensors signal names.
+const char kScreenOrientationChanged[] = "ScreenOrientationChanged";
+
+// The SensorsClient implementation used in production.
+class SensorsClientImpl : public SensorsClient {
+ public:
+  explicit SensorsClientImpl(dbus::Bus* bus)
+      : sensors_proxy_(NULL),
+        weak_ptr_factory_(this) {
+    sensors_proxy_ = bus->GetObjectProxy(chromeos::kSensorsServiceName,
+                                         chromeos::kSensorsServicePath);
+    sensors_proxy_->ConnectToSignal(
+        chromeos::kSensorsServiceInterface,
+        chromeos::kScreenOrientationChanged,
+        base::Bind(&SensorsClientImpl::OrientationChangedReceived,
+                   weak_ptr_factory_.GetWeakPtr()),
+        base::Bind(&SensorsClientImpl::OrientationChangedConnected,
+                   weak_ptr_factory_.GetWeakPtr()));
+  }
+
+  virtual ~SensorsClientImpl() {
+  }
+
+ private:
+  void OrientationChangedReceived(dbus::Signal* signal) {
+    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+    sensors::ScreenOrientation orientation;
+
+    dbus::MessageReader reader(signal);
+    int32 upward = 0;
+    if (!reader.PopInt32(&upward)) {
+      LOG(WARNING) << "Orientation changed signal had incorrect parameters: "
+                   << signal->ToString();
+      return;
+    }
+    VLOG(1) << "Orientation changed to upward " << upward;
+    orientation.upward = static_cast<sensors::ScreenOrientation::Side>(upward);
+
+    sensors::Provider::GetInstance()->ScreenOrientationChanged(orientation);
+  }
+
+  void OrientationChangedConnected(
+      const std::string& interface_name,
+      const std::string& signal_name,
+      bool success) {
+    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+    if (!success)
+      LOG(WARNING) << "Failed to connect to orientation changed signal.";
+  }
+
+  dbus::ObjectProxy* sensors_proxy_;
+  base::WeakPtrFactory<SensorsClientImpl> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SensorsClientImpl);
+};
+
+// The SensorsClient implementation used on Linux desktop,
+// which does nothing.
+class SensorsClientStubImpl : public SensorsClient {
+};
+
+SensorsClient::SensorsClient() {
+}
+
+SensorsClient::~SensorsClient() {
+}
+
+SensorsClient* SensorsClient::Create(dbus::Bus* bus) {
+  if (system::runtime_environment::IsRunningOnChromeOS()) {
+    return new SensorsClientImpl(bus);
+  } else {
+    return new SensorsClientStubImpl();
+  }
+}
+
+}  // namespace chromeos