Support InputRouter recycling

content/browser/renderer_host/input/input_router_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 #include "content/browser/renderer_host/input/input_router.h"
 #include "content/browser/renderer_host/input/touch_action_filter.h"
 #include "content/browser/renderer_host/input/touch_event_queue.h"
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
-#include "content/common/input/input_event_stream_validator.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 
 struct InputHostMsg_HandleInputEvent_ACK_Params;
 
 namespace IPC {
 class Sender;
 }
 
 namespace ui {
 struct LatencyInfo;
 }
 
 namespace content {
 
 class InputAckHandler;
+class InputEventStreamValidator;
 class InputRouterClient;
 class OverscrollController;
 struct DidOverscrollParams;
 
 // A default implementation for browser input event routing.
 class CONTENT_EXPORT InputRouterImpl
     : public NON_EXPORTED_BASE(InputRouter),
       public NON_EXPORTED_BASE(GestureEventQueueClient),
       public NON_EXPORTED_BASE(TouchEventQueueClient),
       public NON_EXPORTED_BASE(TouchpadTapSuppressionControllerClient) {
  public:
   struct CONTENT_EXPORT Config {
     Config();
     GestureEventQueue::Config gesture_config;
     TouchEventQueue::Config touch_config;
+    bool validate_event_stream;
   };
 
   InputRouterImpl(IPC::Sender* sender,
                   InputRouterClient* client,
                   InputAckHandler* ack_handler,
                   int routing_id,
                   const Config& config);
   virtual ~InputRouterImpl();
 
   // InputRouter
-  virtual void Flush() override;
   virtual bool SendInput(scoped_ptr<IPC::Message> message) override;
   virtual void SendMouseEvent(
       const MouseEventWithLatencyInfo& mouse_event) override;
   virtual void SendWheelEvent(
       const MouseWheelEventWithLatencyInfo& wheel_event) override;
   virtual void SendKeyboardEvent(
       const NativeWebKeyboardEvent& key_event,
       const ui::LatencyInfo& latency_info,
       bool is_keyboard_shortcut) override;
   virtual void SendGestureEvent(
       const GestureEventWithLatencyInfo& gesture_event) override;
   virtual void SendTouchEvent(
       const TouchEventWithLatencyInfo& touch_event) override;
+  virtual void Recycle() override;
+  virtual void RequestFlushedNotification() override;
   virtual const NativeWebKeyboardEvent* GetLastKeyboardEvent() const override;
   virtual bool ShouldForwardTouchEvent() const override;
   virtual void OnViewUpdated(int view_flags) override;
   virtual bool HasPendingEvents() const override;
 
   // IPC::Listener
   virtual bool OnMessageReceived(const IPC::Message& message) override;
 
 private:
   friend class InputRouterImplTest;
@@ skipping 180 matching lines @@
   int current_view_flags_;
 
   // The source of the ack within the scope of |ProcessInputEventAck()|.
   // Defaults to ACK_SOURCE_NONE.
   AckSource current_ack_source_;
 
   // Whether a call to |Flush()| has yet been accompanied by a |DidFlush()| call
   // to the client_ after all events have been dispatched/acked.
   bool flush_requested_;
 
+  // Whether we're in the scope of a |Recycle()| call. The only input events
+  // that should conceivably arrive when this is true are gesture events, which
+  // will be summarily dropped.
+  bool in_recycle_;
+
   TouchEventQueue touch_event_queue_;
   GestureEventQueue gesture_event_queue_;
   TouchActionFilter touch_action_filter_;
-  InputEventStreamValidator input_stream_validator_;
-  InputEventStreamValidator output_stream_validator_;
+
+  scoped_ptr<InputEventStreamValidator> optional_input_stream_validator_;
+  scoped_ptr<InputEventStreamValidator> optional_output_stream_validator_;
 
   DISALLOW_COPY_AND_ASSIGN(InputRouterImpl);
 };
 
 }  // namespace content
 
 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_