VR: Route hover and click events to UI elements.

chrome/browser/android/vr_shell/ui_elements/ui_element.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/android/vr_shell/ui_elements/ui_element.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/time/time.h"
@@ skipping 94 matching lines @@
 
 UiElement::~UiElement() = default;
 
 void UiElement::Render(VrShellRenderer* renderer,
                        vr::Mat4f view_proj_matrix) const {
   NOTREACHED();
 }
 
 void UiElement::Initialize() {}
 
+void UiElement::OnHoverEnter() {}
+
+void UiElement::OnHoverLeave() {}
+
+void UiElement::OnButtonDown() {}
+
+void UiElement::OnButtonUp() {}
+
 void UiElement::Animate(const base::TimeTicks& time) {
   for (auto& it : animations) {
     Animation& animation = *it;
     if (time < animation.start)
       continue;
 
     // If |from| is not specified, start at the current values.
     if (animation.from.size() == 0) {
       switch (animation.property) {
         case Animation::SIZE:
@@ skipping 75 matching lines @@
 
 bool UiElement::IsVisible() const {
   return visible && computed_opacity > 0.0f;
 }
 
 bool UiElement::IsHitTestable() const {
   return IsVisible() && hit_testable;
 }
 
 }  // namespace vr_shell