Add a command to lose the context

gpu/command_buffer/tests/gl_test_utils.h

 // Copyright (c) 2012 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.
 
 // Helper functions for GL.
 
 #ifndef GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
 #define GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_
 
 #include <GLES2/gl2.h>
 #include "base/basictypes.h"
 
 class GLTestHelper {
  public:
+  static const uint8 kCheckClearValue = 123u;
+
   static bool HasExtension(const char* extension);
   static bool CheckGLError(const char* msg, int line);
 
   // Compiles a shader.
   // Returns shader, 0 on failure..
   static GLuint LoadShader(GLenum type, const char* shaderSrc);
 
   // Attaches 2 shaders and links them to a program.
   // Returns program, 0 on failure..
   static GLuint SetupProgram(GLuint vertex_shader, GLuint fragment_shader);
@@ skipping 14 matching lines @@
       const uint8* color);
 
   // Uses ReadPixels to save an area of the current FBO/Backbuffer.
   static bool SaveBackbufferAsBMP(const char* filename, int width, int height);
 
   // Run unit tests.
   static int RunTests(int argc, char** argv);
 };
 
 #endif  // GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_