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

ui/gl/test/gl_test_helper.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_TEST_HELPER_H_
+#define UI_GL_TEST_GL_TEST_HELPER_H_
+
+#include "base/basictypes.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace gfx {
+
+class GLTestHelper {
+ public:
+  // Creates a texture object.
+  // Does not check for errors, always returns texture.
+  static GLuint CreateTexture(GLenum target);
+
+  // Compiles a shader.
+  // Does not check for errors, always returns shader.
+  static GLuint CompileShader(GLenum type, const char* src);
+
+  // Compiles a shader and checks for compilation errors.
+  // Returns shader, 0 on failure.
+  static GLuint LoadShader(GLenum type, const char* src);
+
+  // Attaches 2 shaders and links them to a program.
+  // Does not check for errors, always returns program.
+  static GLuint LinkProgram(GLuint vertex_shader, GLuint fragment_shader);
+
+  // Attaches 2 shaders, links them to a program, and checks for errors.
+  // Returns program, 0 on failure.
+  static GLuint SetupProgram(GLuint vertex_shader, GLuint fragment_shader);
+
+  // Creates a framebuffer, attaches a color buffer, and checks for errors.
+  // Returns framebuffer, 0 on failure.
+  static GLuint SetupFramebuffer(int width, int height);
+
+  // Checks an area of pixels for a color.
+  static bool CheckPixels(GLint x,
+                          GLint y,
+                          GLsizei width,
+                          GLsizei height,
+                          const uint8_t expected_color[4]);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_TEST_GL_TEST_HELPER_H_