Touch emulator: allow multiple touch streams.

content/browser/renderer_host/input/touch_emulator.h

 // Copyright 2014 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_TOUCH_EMULATOR_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_H_
 
 #include "content/browser/renderer_host/input/touch_emulator_client.h"
 #include "content/common/cursors/webcursor.h"
 #include "content/common/input/input_event_ack_state.h"
@@ skipping 11 matching lines @@
 
   void Enable(bool allow_pinch);
   void Disable();
 
   // Returns |true| if the event was consumed.
   // TODO(dgozman): maybe pass latency info together with events.
   bool HandleMouseEvent(const blink::WebMouseEvent& event);
   bool HandleMouseWheelEvent(const blink::WebMouseWheelEvent& event);
   bool HandleKeyboardEvent(const blink::WebKeyboardEvent& event);
 
-  // Returns |true| if the event ack was consumed. Consumed ack should not
-  // propagate any further.
-  bool HandleTouchEventAck(InputEventAckState ack_result);
+  void HandleTouchEventAck(InputEventAckState ack_result);
 
   // Cancel any touches, for example, when focus is lost.
   void CancelTouch();
 
  private:
   // ui::GestureProviderClient implementation.
   virtual void OnGestureEvent(const ui::GestureEventData& gesture) OVERRIDE;
 
   // Returns cursor size in DIP.
   gfx::SizeF InitCursorFromResource(
@@ skipping 50 matching lines @@
   // The cumulative scale change from the start of pinch gesture.
   float pinch_scale_;
   bool pinch_gesture_active_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchEmulator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_H_