Make sure send one WebTouchEvent ack per ui::TouchEvent

content/browser/renderer_host/render_widget_host_view_aura.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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 346 matching lines @@
   ~RenderWidgetHostViewAura() override;
 
   // Exposed for tests.
   aura::Window* window() { return window_; }
   SkColorType PreferredReadbackFormat() override;
   DelegatedFrameHost* GetDelegatedFrameHost() const {
     return delegated_frame_host_.get();
   }
   const ui::MotionEventAura& pointer_state() const { return pointer_state_; }
 
+  // Reset unchange touch point to StateStationary for touchmove and
+  // touchcancel.
+  void SetTouchPointStateStationary(blink::WebTouchEvent* event, int touch_id);

[jdduke (slow), 2015/05/08 02:20:32]

If we need this let's go ahead and make it static.

+
  private:
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            PopupRetainsCaptureAfterMouseRelease);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest, SetCompositionText);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest, TouchEventState);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            TouchEventPositionsArentRounded);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest, TouchEventSyncAsync);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest, Resize);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest, SwapNotifiesWindow);
@@ skipping 293 matching lines @@
   // compositing surface and showing the disambiguation popup.
   gfx::Vector2dF disambiguation_scroll_offset_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAura> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_