VR: System indicator rework.

chrome/browser/android/vr_shell/ui_elements/system_indicator.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 "chrome/browser/android/vr_shell/ui_elements/system_indicator.h"
+
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/android/vr_shell/textures/system_indicator_texture.h"
+
+namespace vr_shell {
+
+SystemIndicator::SystemIndicator(int preferred_width,
+                                 float height_meters,
+                                 const gfx::VectorIcon& icon,
+                                 int string_id)
+    : TexturedElement(preferred_width), height_meters_(height_meters) {
+  if (string_id != 0) {
+    texture_ = base::MakeUnique<SystemIndicatorTexture>(icon, string_id);
+  } else {
+    texture_ = base::MakeUnique<SystemIndicatorTexture>(icon);
+  }
+}
+
+void SystemIndicator::UpdateElementSize() {
+  gfx::SizeF drawn_size = GetTexture()->GetDrawnSize();
+  float width = height_meters_ * drawn_size.width() / drawn_size.height();
+  set_size({width, height_meters_, 1});
+}
+
+SystemIndicator::~SystemIndicator() = default;
+
+UiTexture* SystemIndicator::GetTexture() const {
+  return texture_.get();
+}
+
+}  // namespace vr_shell