Migrating majority of gamepad from content/browser/ to device/

content/browser/gamepad/gamepad_service.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_GAMEPAD_GAMEPAD_SERVICE_H_
 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_SERVICE_H_
 
 #include <memory>
 #include <set>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/singleton.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
+#include "device/gamepad/gamepad_provider.h"
 
 namespace blink {
 class WebGamepad;
 }
 
-namespace content {
-
+namespace device {
 class GamepadConsumer;
 class GamepadDataFetcher;
 class GamepadProvider;
+}
+
+namespace content {
+
 class GamepadServiceTestConstructor;
 class RenderProcessHost;
 
 // Owns the GamepadProvider (the background polling thread) and keeps track of
 // the number of consumers currently using the data (and pausing the provider
 // when not in use).
-class CONTENT_EXPORT GamepadService {
+class CONTENT_EXPORT GamepadService
+    : public device::GamepadConnectionChangeClient {
  public:
   // Returns the GamepadService singleton.
   static GamepadService* GetInstance();
 
   // Increments the number of users of the provider. The Provider is running
   // when there's > 0 users, and is paused when the count drops to 0.
   // consumer is registered to listen for gamepad connections. If this is the
   // first time it is added to the set of consumers it will be treated
   // specially: it will not be informed about connections before a new user
   // gesture is observed at which point it will be notified for every connected
   // gamepads.
   //
   // Must be called on the I/O thread.
-  void ConsumerBecameActive(GamepadConsumer* consumer);
+  void ConsumerBecameActive(device::GamepadConsumer* consumer);
 
   // Decrements the number of users of the provider. consumer will not be
   // informed about connections until it's added back via ConsumerBecameActive.
   // Must be matched with a ConsumerBecameActive call.
   //
   // Must be called on the I/O thread.
-  void ConsumerBecameInactive(GamepadConsumer* consumer);
+  void ConsumerBecameInactive(device::GamepadConsumer* consumer);
 
   // Decrements the number of users of the provider and removes consumer from
   // the set of consumers. Should be matched with a a ConsumerBecameActive
   // call.
   //
   // Must be called on the I/O thread.
-  void RemoveConsumer(GamepadConsumer* consumer);
+  void RemoveConsumer(device::GamepadConsumer* consumer);
 
   // Registers the given closure for calling when the user has interacted with
   // the device. This callback will only be issued once. Should only be called
   // while a consumer is active.
   void RegisterForUserGesture(const base::Closure& closure);
 
   // Returns the shared memory handle of the gamepad data duplicated into the
   // given process.
   base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
       base::ProcessHandle handle);
 
   // Stop/join with the background thread in GamepadProvider |provider_|.
   void Terminate();
 
   // Called on IO thread when a gamepad is connected.
   void OnGamepadConnected(int index, const blink::WebGamepad& pad);
 
   // Called on IO thread when a gamepad is disconnected.
   void OnGamepadDisconnected(int index, const blink::WebGamepad& pad);
 
  private:
   friend struct base::DefaultSingletonTraits<GamepadService>;
   friend class GamepadServiceTestConstructor;
   friend class GamepadServiceTest;
 
   GamepadService();
 
   // Constructor for testing. This specifies the data fetcher to use for a
   // provider, bypassing the default platform one.
-  GamepadService(std::unique_ptr<GamepadDataFetcher> fetcher);
+  GamepadService(
+      std::unique_ptr<device::GamepadDataFetcher> fetcher);
 
   virtual ~GamepadService();
 
   static void SetInstance(GamepadService*);
 
   void OnUserGesture();
 
+  void OnGamepadConnectionChange(bool connected,
+                                 int index,
+                                 const blink::WebGamepad& pad) override;
+
   struct ConsumerInfo {
-    ConsumerInfo(GamepadConsumer* consumer)
-        : consumer(consumer),
-          did_observe_user_gesture(false) {
-    }
+    ConsumerInfo(device::GamepadConsumer* consumer)
+        : consumer(consumer), did_observe_user_gesture(false) {}
 
     bool operator<(const ConsumerInfo& other) const {
       return consumer < other.consumer;
     }
 
-    GamepadConsumer* consumer;
+    device::GamepadConsumer* consumer;
     mutable bool is_active;
     mutable bool did_observe_user_gesture;
   };
 
-  std::unique_ptr<GamepadProvider> provider_;
+  std::unique_ptr<device::GamepadProvider> provider_;
 
   base::ThreadChecker thread_checker_;
 
   typedef std::set<ConsumerInfo> ConsumerSet;
   ConsumerSet consumers_;
 
   int num_active_consumers_;
 
   bool gesture_callback_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_SERVICE_H_