input: Fix running the completion callback for telemetry gesture.

content/browser/renderer_host/input/synthetic_gesture_controller.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_SYNTHETIC_GESTURE_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_
 
 #include <memory>
 #include <queue>
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
 #include "content/common/content_export.h"
 #include "content/common/input/synthetic_gesture_params.h"
 
 namespace content {
 
 class SyntheticGestureTarget;
 
 // Controls a synthetic gesture.
 // Repeatedly invokes the gesture object's ForwardInputEvent method to send
 // input events to the platform until the gesture has finished.
 class CONTENT_EXPORT SyntheticGestureController {
  public:
-  using BeginFrameCallback = base::OnceClosure;
-  using BeginFrameRequestCallback =
-      base::RepeatingCallback<void(BeginFrameCallback)>;
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    // Requests a single begin frame. The passed callback is run on the next
+    // begin frame message.
+    virtual void RequestBeginFrameForSynthesizedInput(
+        base::OnceClosure callback) = 0;
+
+    // Returns whether any gesture created by dispatched input events has
+    // completed or not.
+    virtual bool HasGestureStopped() = 0;
+  };
   SyntheticGestureController(
-      std::unique_ptr<SyntheticGestureTarget> gesture_target,
-      BeginFrameRequestCallback begin_frame_callback);
+      Delegate* delegate,
+      std::unique_ptr<SyntheticGestureTarget> gesture_target);
   virtual ~SyntheticGestureController();
 
   typedef base::Callback<void(SyntheticGesture::Result)>
       OnGestureCompleteCallback;
   void QueueSyntheticGesture(
       std::unique_ptr<SyntheticGesture> synthetic_gesture,
       const OnGestureCompleteCallback& completion_callback);
 
   bool DispatchNextEvent(base::TimeTicks = base::TimeTicks::Now());
 
  private:
+  void RequestBeginFrame();
   void OnBeginFrame();
 
   void StartGesture(const SyntheticGesture& gesture);
   void StopGesture(const SyntheticGesture& gesture,
                    const OnGestureCompleteCallback& completion_callback,
                    SyntheticGesture::Result result);
 
+  Delegate* const delegate_;
   std::unique_ptr<SyntheticGestureTarget> gesture_target_;
 
   // A queue of gesture/callback pairs.  Implemented as two queues to
   // simplify the ownership of SyntheticGesture pointers.
   class GestureAndCallbackQueue {
   public:
     GestureAndCallbackQueue();
     ~GestureAndCallbackQueue();
     void Push(std::unique_ptr<SyntheticGesture> gesture,
               const OnGestureCompleteCallback& callback) {
       gestures_.push_back(std::move(gesture));
       callbacks_.push(callback);
     }
     void Pop() {
       gestures_.erase(gestures_.begin());
       callbacks_.pop();
+      result_of_current_gesture_ = SyntheticGesture::GESTURE_RUNNING;
     }
     SyntheticGesture* FrontGesture() { return gestures_.front().get(); }
     OnGestureCompleteCallback& FrontCallback() {
       return callbacks_.front();
     }
-    bool IsEmpty() {
+    bool IsEmpty() const {
       CHECK(gestures_.empty() == callbacks_.empty());
       return gestures_.empty();
     }
+
+    bool is_current_gesture_complete() const {
+      return result_of_current_gesture_ != SyntheticGesture::GESTURE_RUNNING;
+    }
+
+    SyntheticGesture::Result current_gesture_result() const {
+      return result_of_current_gesture_;
+    }
+
+    void mark_current_gesture_complete(SyntheticGesture::Result result) {
+      result_of_current_gesture_ = result;
+    }
+
    private:
+    SyntheticGesture::Result result_of_current_gesture_ =
+        SyntheticGesture::GESTURE_RUNNING;
     std::vector<std::unique_ptr<SyntheticGesture>> gestures_;
     std::queue<OnGestureCompleteCallback> callbacks_;
 
     DISALLOW_COPY_AND_ASSIGN(GestureAndCallbackQueue);
   } pending_gesture_queue_;
 
-  BeginFrameRequestCallback begin_frame_callback_;
-
   base::WeakPtrFactory<SyntheticGestureController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticGestureController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_CONTROLLER_H_