Re-land: ui: Add GLImage unit test framework.

ui/gl/test/gl_image_test_support.h

+// Copyright 2015 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_TEST_GL_IMAGE_TEST_SUPPORT_H_
+#define UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_
+
+#include "ui/gfx/buffer_types.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace gfx {
+
+class GLImageTestSupport {
+ public:
+  // Initialize GL for image testing.
+  static void InitializeGL();
+
+  // Cleanup GL after being initialized for image testing.
+  static void CleanupGL();
+
+  // Returns the preferred internal format used for images.
+  static GLenum GetPreferredInternalFormat();
+
+  // Returns the preferred buffer format used for images.
+  static BufferFormat GetPreferredBufferFormat();
+
+  // Initialize buffer of a specific |format| to |color|.
+  static void SetBufferDataToColor(int width,
+                                   int height,
+                                   int stride,
+                                   BufferFormat format,
+                                   const uint8_t color[4],
+                                   uint8_t* data);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_