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

device/gamepad/gamepad_provider.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_PROVIDER_H_
-#define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
+#ifndef DEVICE_GAMEPAD_GAMEPAD_PROVIDER_H_
+#define DEVICE_GAMEPAD_GAMEPAD_PROVIDER_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/system_monitor/system_monitor.h"
-#include "content/common/content_export.h"
+#include "device/gamepad/gamepad_export.h"
+#include "device/gamepad/gamepad_shared_buffer.h"
 #include "third_party/WebKit/public/platform/WebGamepads.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class Thread;
 }
 
-namespace content {
+namespace device {
 
 class GamepadDataFetcher;
-struct GamepadHardwareBuffer;
 
-class CONTENT_EXPORT GamepadProvider :
-  public base::SystemMonitor::DevicesChangedObserver {
+class DEVICE_GAMEPAD_EXPORT GamepadConnectionChangeClient {
  public:
-  GamepadProvider();
+  virtual void OnGamepadConnectionChange(bool connected,
+                                         int index,
+                                         const blink::WebGamepad& pad) = 0;
+};
+
+class DEVICE_GAMEPAD_EXPORT GamepadProvider
+    : public base::SystemMonitor::DevicesChangedObserver {
+ public:
+  explicit GamepadProvider(
+      std::unique_ptr<GamepadSharedBuffer> buffer,
+      GamepadConnectionChangeClient* connection_change_client);
 
   // Manually specifies the data fetcher. Used for testing.
-  explicit GamepadProvider(std::unique_ptr<GamepadDataFetcher> fetcher);
+  explicit GamepadProvider(
+      std::unique_ptr<GamepadSharedBuffer> buffer,
+      GamepadConnectionChangeClient* connection_change_client,
+      std::unique_ptr<GamepadDataFetcher> fetcher);
 
   ~GamepadProvider() override;
 
   // Returns the shared memory handle of the gamepad data duplicated into the
   // given process.
   base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
       base::ProcessHandle renderer_process);
 
   void GetCurrentGamepadData(blink::WebGamepads* data);
 
@@ skipping 20 matching lines @@
   // polling_thread_.
   void SendPauseHint(bool paused);
 
   // Method for polling a GamepadDataFetcher. Runs on the polling_thread_.
   void DoPoll();
   void ScheduleDoPoll();
 
   void OnGamepadConnectionChange(bool connected,
                                  int index,
                                  const blink::WebGamepad& pad);
-  void DispatchGamepadConnectionChange(bool connected,
-                                       int index,
-                                       const blink::WebGamepad& pad);
-
-  GamepadHardwareBuffer* SharedMemoryAsHardwareBuffer();
 
   // Checks the gamepad state to see if the user has interacted with it.
   void CheckForUserGesture();
 
   enum { kDesiredSamplingIntervalMs = 16 };
 
   // Keeps track of when the background thread is paused. Access to is_paused_
   // must be guarded by is_paused_lock_.
   base::Lock is_paused_lock_;
   bool is_paused_;
@@ skipping 26 matching lines @@
   // to enable it to avoid redundant (and possibly expensive) is-connected
   // tests. Access to devices_changed_ must be guarded by
   // devices_changed_lock_.
   base::Lock devices_changed_lock_;
   bool devices_changed_;
 
   bool ever_had_user_gesture_;
 
   class PadState {
    public:
-    PadState() {
-      SetDisconnected();
-    }
+    PadState() { SetDisconnected(); }
 
     bool Match(const blink::WebGamepad& pad) const;
     void SetPad(const blink::WebGamepad& pad);
     void SetDisconnected();
     void AsWebGamepad(blink::WebGamepad* pad);
 
     bool connected() const { return connected_; }
 
    private:
     bool connected_;
     unsigned axes_length_;
     unsigned buttons_length_;
     blink::WebUChar id_[blink::WebGamepad::idLengthCap];
     blink::WebUChar mapping_[blink::WebGamepad::mappingLengthCap];
   };
 
   // Used to detect connections and disconnections.
   std::unique_ptr<PadState[]> pad_states_;
 
   // Only used on the polling thread.
   std::unique_ptr<GamepadDataFetcher> data_fetcher_;
 
   base::Lock shared_memory_lock_;
-  base::SharedMemory gamepad_shared_memory_;
+  std::unique_ptr<GamepadSharedBuffer> gamepad_shared_buffer_;
 
   // Polling is done on this background thread.
   std::unique_ptr<base::Thread> polling_thread_;
 
+  GamepadConnectionChangeClient* connection_change_client_;
+
   static GamepadProvider* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadProvider);
 };
 
-}  // namespace content
+}  // namespace device
 
-#endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
+#endif  // DEVICE_GAMEPAD_GAMEPAD_PROVIDER_H_