Introduce ChromeVR to Chrome on Android (behind a build flag)

chrome/browser/android/vr_shell/vr_util.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_VR_UTIL_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_VR_UTIL_H_
+
+#include <string>
+
+#include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr_types.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace vr_shell {
+
+std::array<float, 16> MatrixToGLArray(const gvr::Mat4f& matrix);
+
+// Util functions that are copied from the treasure_hunt NDK demo in
+// third_party/gvr-andoir-sdk/ folder.
+gvr::Mat4f MatrixTranspose(const gvr::Mat4f& mat);
+gvr::Mat4f MatrixMul(const gvr::Mat4f& matrix1, const gvr::Mat4f& matrix2);
+gvr::Mat4f PerspectiveMatrixFromView(const gvr::Rectf& fov,
+                                     float z_near,
+                                     float z_far);
+gvr::Rectf ModulateRect(const gvr::Rectf& rect, float width, float height);
+gvr::Recti CalculatePixelSpaceRect(const gvr::Sizei& texture_size,
+                                   const gvr::Rectf& texture_rect);
+
+// Compile a shader.
+GLuint CompileShader(GLenum shader_type,
+                     const GLchar* shader_source,
+                     std::string& error);
+
+// Compile and link a program.
+GLuint CreateAndLinkProgram(GLuint vertex_shader_handle,
+                            GLuint fragment_shader_handle,
+                            int num_attributes,
+                            const GLchar** attributes,
+                            std::string& error);
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_UTIL_H_