exo: Implement v6 of touch protocol including shape and frame event

components/exo/touch.h

 // Copyright 2015 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 COMPONENTS_EXO_TOUCH_H_
 #define COMPONENTS_EXO_TOUCH_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
   explicit Touch(TouchDelegate* delegate);
   ~Touch() override;
 
   // Overridden from ui::EventHandler:
   void OnTouchEvent(ui::TouchEvent* event) override;
 
   // Overridden from SurfaceObserver:
   void OnSurfaceDestroying(Surface* surface) override;
 
  private:
+  struct TouchDetails {
+    int id;
+    float major;
+    float minor;
+  };
+
   // Returns the effective target for |event|.
   Surface* GetEffectiveTargetForEvent(ui::Event* event) const;
 
   // The delegate instance that all events are dispatched to.
   TouchDelegate* const delegate_;
 
   // The current focus surface for the touch device.
   Surface* focus_ = nullptr;
 
   // Vector of touch points in focus surface.
-  std::vector<int> touch_points_;
+  std::vector<TouchDetails> touch_points_;
+
+  // Helper method to find touches of a specific id.
+  std::vector<TouchDetails>::iterator FindTouch(int id);
 
   DISALLOW_COPY_AND_ASSIGN(Touch);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_TOUCH_H_