[CRD iOS] Move UI stuff into a subdirectory

remoting/client/view_matrix.cc

-// Copyright 2017 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 "remoting/client/view_matrix.h"
-
-namespace remoting {
-
-ViewMatrix::ViewMatrix() : ViewMatrix(0.f, {0.f, 0.f}) {}
-
-ViewMatrix::ViewMatrix(float scale, const Vector2D& offset)
-    : scale_(scale), offset_(offset) {}
-
-ViewMatrix::~ViewMatrix() {}
-
-ViewMatrix::Point ViewMatrix::MapPoint(const Point& point) const {
-  float x = scale_ * point.x + offset_.x;
-  float y = scale_ * point.y + offset_.y;
-  return {x, y};
-}
-
-ViewMatrix::Vector2D ViewMatrix::MapVector(const Vector2D& vector) const {
-  float x = scale_ * vector.x;
-  float y = scale_ * vector.y;
-  return {x, y};
-}
-
-void ViewMatrix::SetScale(float scale) {
-  scale_ = scale;
-}
-
-float ViewMatrix::GetScale() const {
-  return scale_;
-}
-
-void ViewMatrix::SetOffset(const Point& offset) {
-  offset_ = offset;
-}
-
-void ViewMatrix::PostScale(const Point& pivot, float scale) {
-  scale_ *= scale;
-  offset_.x *= scale;
-  offset_.x += (1.f - scale) * pivot.x;
-  offset_.y *= scale;
-  offset_.y += (1.f - scale) * pivot.y;
-}
-
-void ViewMatrix::PostTranslate(const Vector2D& delta) {
-  offset_.x += delta.x;
-  offset_.y += delta.y;
-}
-
-ViewMatrix ViewMatrix::Invert() const {
-  return ViewMatrix(1.f / scale_, {-offset_.x / scale_, -offset_.y / scale_});
-}
-
-std::array<float, 9> ViewMatrix::ToMatrixArray() const {
-  return {{scale_, 0, offset_.x,  // Row 1
-           0, scale_, offset_.y,  // Row 2
-           0, 0, 1}};
-}
-
-bool ViewMatrix::IsEmpty() const {
-  return scale_ == 0.f && offset_.x == 0.f && offset_.y == 0.f;
-}
-
-}  // namespace remoting