Refactor GL surface format handling

ui/gl/gl_surface_format.h

Index: ui/gl/gl_surface_format.h
diff --git a/ui/gl/gl_surface_format.h b/ui/gl/gl_surface_format.h
new file mode 100644
index 0000000000000000000000000000000000000000..cb7d51d7baaa0db43b655cdb1f0c909031a90257
--- /dev/null
+++ b/ui/gl/gl_surface_format.h
@@ -0,0 +1,73 @@
+// 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 UI_GL_GL_SURFACE_FORMAT_H_
+#define UI_GL_GL_SURFACE_FORMAT_H_
+
+#include "ui/gl/gl_export.h"
+
+namespace gl {
+
+class GL_EXPORT GLSurfaceFormat {
+ public:
+
+  // For use with constructor.
+  enum SurfacePixelLayout {
+    PIXEL_LAYOUT_DONT_CARE = -1,
+    PIXEL_LAYOUT_BGRA,
+    PIXEL_LAYOUT_RGBA,
+  };
+
+  GLSurfaceFormat();
+
+  ~GLSurfaceFormat();
+
+  GLSurfaceFormat(SurfacePixelLayout layout);
+
+  GLSurfaceFormat(const GLSurfaceFormat& other);
+
+  bool IsDefault();
+
+  void SetIsSurfaceless();
+  bool IsSurfaceless();
+
+  bool IsCompatible(GLSurfaceFormat other_format);
+
+  // Default pixel format is RGBA8888. Use this method to select
+  // a preference of RGB565. TODO(klausw): use individual setter
+  // methods if there's a use case for them.
+  void SetRGB565();
+
+  // Other properties for future use.
+  void SetDepthBits(int depth_bits);
+  int GetDepthBits();
+
+  void SetStencilBits(int stencil_bits);
+  int GetStencilBits();
+
+  void SetSamples(int samples);
+  int GetSamples();
+
+  void SetDefaultPixelLayout(SurfacePixelLayout layout);
+
+  SurfacePixelLayout GetPixelLayout();
+
+  int GetBufferSize();
+
+ private:
+  bool is_default_ = true;
+  SurfacePixelLayout pixel_layout_ = PIXEL_LAYOUT_DONT_CARE;
+  bool is_surfaceless_ = false;
+  int red_bits_ = -1;
+  int green_bits_ = -1;
+  int blue_bits_ = -1;
+  int alpha_bits_ = -1;
+  int depth_bits_ = -1;
+  int samples_ = -1;
+  int stencil_bits_ = -1;
+};
+
+}  // namespace gl
+
+#endif  // UI_GL_GL_SURFACE_FORMAT_H_