[Reland] Add gl tests to make sure when a buffer is unmapped, all access path generates an INVALID_…

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 <stdint.h>
 
+#include <vector>
+
 namespace gfx {
 class Size;
 }  // namespace gfx
 
 class GLTestHelper {
  public:
   static const uint8_t kCheckClearValue = 123u;
 
   static bool HasExtension(const char* extension);
   static bool CheckGLError(const char* msg, int line);
@@ skipping 17 matching lines @@
   // Compiles 2 shaders, attaches and links them to a program
   // Returns program, 0 on failure.
   static GLuint LoadProgram(
       const char* vertex_shader_source,
       const char* fragment_shader_source);
 
   // Make a unit quad with position only.
   // Returns the created buffer.
   static GLuint SetupUnitQuad(GLint position_location);
 
+  // Returns a vector of size 2. The first is the array buffer object,
+  // the second is the element array buffer object.
+  static std::vector<GLuint> SetupIndexedUnitQuad(GLint position_location);
+
   // Make a 6 vertex colors.
   // Returns the created buffer.
   static GLuint SetupColorsForUnitQuad(
       GLint location, const GLfloat color[4], GLenum usage);
 
   // Checks an area of pixels for a color.
   static bool CheckPixels(GLint x,
                           GLint y,
                           GLsizei width,
                           GLsizei height,
                           GLint tolerance,
                           const uint8_t* color);
 
   // Uses ReadPixels to save an area of the current FBO/Backbuffer.
   static bool SaveBackbufferAsBMP(const char* filename, int width, int height);
 
   static void DrawTextureQuad(GLenum target, const gfx::Size& size);
 };
 
 #endif  // GPU_COMMAND_BUFFER_TESTS_GL_TEST_UTILS_H_