Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/orientation_message_filter.cc

Index: content/browser/device_orientation/orientation_message_filter.cc
diff --git a/content/browser/device_orientation/orientation_message_filter.cc b/content/browser/device_orientation/orientation_message_filter.cc
index 11b1e06aea610bd7cceac3f21df397d3866beeac..045308b36964d132dd513908d3cdce8bd6943817 100644
--- a/content/browser/device_orientation/orientation_message_filter.cc
+++ b/content/browser/device_orientation/orientation_message_filter.cc
@@ -4,10 +4,7 @@
 
 #include "content/browser/device_orientation/orientation_message_filter.h"
 
-#include "base/memory/scoped_ptr.h"
-#include "content/browser/device_orientation/orientation.h"
-#include "content/browser/device_orientation/provider.h"
-#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/device_orientation/device_data.h"
 #include "content/common/device_orientation_messages.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -15,66 +12,15 @@ using content::BrowserThread;
 
 namespace device_orientation {
 
-OrientationMessageFilter::OrientationMessageFilter() : provider_(NULL) {
+OrientationMessageFilter::OrientationMessageFilter()
+    :  MessageFilter(DeviceData::kTypeOrientation) {
 }
 
 OrientationMessageFilter::~OrientationMessageFilter() {
 }
 
-class OrientationMessageFilter::ObserverDelegate
-    : public base::RefCounted<ObserverDelegate>, public Provider::Observer {
- public:
-    // Create ObserverDelegate that observes provider and forwards updates to
-    // render_view_id in process_id.
-    // Will stop observing provider when destructed.
-    ObserverDelegate(Provider* provider,
-                     int render_view_id,
-                     IPC::Sender* sender);
-
-    // From Provider::Observer.
-    virtual void OnOrientationUpdate(const Orientation& orientation);
-
- private:
-  friend class base::RefCounted<ObserverDelegate>;
-  virtual ~ObserverDelegate();
-
-  scoped_refptr<Provider> provider_;
-  int render_view_id_;
-  IPC::Sender* sender_;  // Weak pointer.
-
-  DISALLOW_COPY_AND_ASSIGN(ObserverDelegate);
-};
-
-OrientationMessageFilter::ObserverDelegate::ObserverDelegate(Provider* provider,
-                                                  int render_view_id,
-                                                  IPC::Sender* sender)
-    : provider_(provider),
-      render_view_id_(render_view_id),
-      sender_(sender) {
-  provider_->AddObserver(this);
-}
-
-OrientationMessageFilter::ObserverDelegate::~ObserverDelegate() {
-  provider_->RemoveObserver(this);
-}
-
-void OrientationMessageFilter::ObserverDelegate::OnOrientationUpdate(
-    const Orientation& orientation) {
-  DeviceOrientationMsg_Updated_Params params;
-  params.can_provide_alpha = orientation.can_provide_alpha();
-  params.alpha = orientation.alpha();
-  params.can_provide_beta = orientation.can_provide_beta();
-  params.beta = orientation.beta();
-  params.can_provide_gamma = orientation.can_provide_gamma();
-  params.gamma = orientation.gamma();
-  params.can_provide_absolute = orientation.can_provide_absolute();
-  params.absolute = orientation.absolute();
-
-  sender_->Send(new DeviceOrientationMsg_Updated(render_view_id_, params));
-}
-
 bool OrientationMessageFilter::OnMessageReceived(const IPC::Message& message,
-                                      bool* message_was_ok) {
+                                                 bool* message_was_ok) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(OrientationMessageFilter, message, *message_was_ok)
@@ -85,21 +31,4 @@ bool OrientationMessageFilter::OnMessageReceived(const IPC::Message& message,
   return handled;
 }
 
-void OrientationMessageFilter::OnStartUpdating(int render_view_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  if (!provider_)
-    provider_ = Provider::GetInstance();
-
-  observers_map_[render_view_id] = new ObserverDelegate(provider_,
-                                                        render_view_id,
-                                                        this);
-}
-
-void OrientationMessageFilter::OnStopUpdating(int render_view_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-
-  observers_map_.erase(render_view_id);
-}
-
 }  // namespace device_orientation