Add VR Shell animation classes and unit test.

chrome/browser/android/vr_shell/ui_elements.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_H_
 
 #include <cmath>
 #include <vector>
 
 #include "base/logging.h"
-#include "chrome/browser/android/vr_shell/vr_util.h"
+#include "chrome/browser/android/vr_shell/vr_math.h"
 #include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr_types.h"
 
 namespace vr_shell {
 
+class Animation;
+
 enum XAnchoring {
   XLEFT = 0,
   XRIGHT,
   XCENTER,
   XNONE
 };
 
 enum YAnchoring {
   YTOP = 0,
   YBOTTOM,
@@ skipping 27 matching lines @@
 struct WorldRectangle : public WorldObject {
   gvr::Vec3f GetCenter() const;
   gvr::Vec3f GetNormal() const;
   float GetRayDistance(gvr::Vec3f rayOrigin, gvr::Vec3f rayVector) const;
 };
 
 struct ContentRectangle : public WorldRectangle {
   ContentRectangle();
   ~ContentRectangle();
 
-  int id;
+  void Animate(int64_t time);
+
+  int id = 0;
+
   // samplerExternalOES texture data for desktop content image.
   int content_texture_handle;

[David Trainor- moved to gerrit, 2016/09/14 21:43:30]

If we're specifying these in the header, should we default this one to something
as well?

[cjgrant, 2016/09/16 17:47:08]

Done.

-  Rectf copy_rect;
-  Recti window_rect;
-  gvr::Vec3f size;
-  gvr::Vec3f translation;
-  XAnchoring x_anchoring;
-  YAnchoring y_anchoring;
-  bool anchor_z;
+  Rectf copy_rect = {0.0f, 0.0f, 0.0f, 0.0f};
+  Recti window_rect = {0.0f, 0.0f, 0.0f, 0.0f};
+  gvr::Vec3f size = {0.0f, 0.0f, 0.0f};
+  gvr::Vec3f translation = {0.0f, 0.0f, 0.0f};
+  XAnchoring x_anchoring = XAnchoring::XNONE;
+  YAnchoring y_anchoring = YAnchoring::YNONE;
+  bool anchor_z = false;
   std::vector<float> orientation_axis_angle;
   std::vector<float> rotation_axis_angle;
+  std::vector<std::unique_ptr<Animation>> animations;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentRectangle);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_H_