Add VR Shell animation classes and unit test.

chrome/browser/android/vr_shell/vr_gl.h

Index: chrome/browser/android/vr_shell/vr_gl.h
diff --git a/chrome/browser/android/vr_shell/vr_gl.h b/chrome/browser/android/vr_shell/vr_gl.h
new file mode 100644
index 0000000000000000000000000000000000000000..2aca8d97ec8452d87fcfabde47b5929378d12f50
--- /dev/null
+++ b/chrome/browser/android/vr_shell/vr_gl.h
@@ -0,0 +1,31 @@
+// 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.

[bshe, 2016/09/12 15:38:27]

perhaps use vr_gl_util as file name?

[cjgrant, 2016/09/13 17:32:16]

I've been encouraged not to name files "util", as it implies a dumping ground. 
Personally I like vr_gl_util.  :)

[bshe, 2016/09/13 19:37:22]

ack.

+
+#ifndef CHROME_BROWSER_ANDROID_VR_SHELL_VR_GL_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_VR_GL_H_
+
+#include "ui/gl/gl_bindings.h"
+
+namespace vr_shell {
+
+std::array<float, 16> MatrixToGLArray(const gvr::Mat4f& matrix);
+
+gvr::Recti CalculatePixelSpaceRect(const gvr::Sizei& texture_size,
+                                   const gvr::Rectf& texture_rect);:w

[mthiesse, 2016/09/12 14:18:27]

Now now, no need to brag about your vim usage.

;)

+
+// 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_GL_H_