VR: Add a loading indicator to the scene.

chrome/browser/android/vr_shell/textures/loading_indicator_texture.h

+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_LOADING_INDICATOR_TEXTURE_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_LOADING_INDICATOR_TEXTURE_H_
+
+#include "chrome/browser/android/vr_shell/textures/ui_texture.h"
+#include "ui/gfx/geometry/size.h"
+
+class SkCanvas;
+
+namespace vr_shell {
+
+class LoadingIndicatorTexture : public UiTexture {
+ public:
+  LoadingIndicatorTexture();
+  ~LoadingIndicatorTexture() override;
+  gfx::Size GetPreferredTextureSize(int width) const override;
+  gfx::SizeF GetDrawnSize() const override;
+
+  void SetLoading(bool loading);
+  void SetLoadProgress(float progress);
+
+ private:
+  void Draw(SkCanvas* canvas, const gfx::Size& texture_size) override;
+  gfx::SizeF size_;
+  bool loading_ = false;
+  float progress_ = 0;
+};
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_LOADING_INDICATOR_TEXTURE_H_