Revert of gpu: Make glTexSubImage2D work with GL_SRGB_ALPHA on OpenGL

gpu/command_buffer/tests/gl_ext_srgb_unittest.cc

Index: gpu/command_buffer/tests/gl_ext_srgb_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_ext_srgb_unittest.cc b/gpu/command_buffer/tests/gl_ext_srgb_unittest.cc
deleted file mode 100644
index 37b8eef4536254d44374c0036d555c9b1a891f74..0000000000000000000000000000000000000000
--- a/gpu/command_buffer/tests/gl_ext_srgb_unittest.cc
+++ /dev/null
@@ -1,73 +0,0 @@
-// Copyright (c) 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.
-
-#include <GLES2/gl2.h>
-#include <GLES2/gl2ext.h>
-
-#include "gpu/command_buffer/tests/gl_manager.h"
-#include "gpu/command_buffer/tests/gl_test_utils.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace gpu {
-
-// A collection of tests that exercise the GL_EXT_srgb extension.
-class GLEXTSRGBTest : public testing::Test {
- protected:
-  void SetUp() override { gl_.Initialize(GLManager::Options()); }
-  void TearDown() override { gl_.Destroy(); }
-  bool IsApplicable() const {
-    return GLTestHelper::HasExtension("GL_EXT_sRGB");
-  }
-  GLManager gl_;
-};
-
-// Test to ensure that GL_SRGB_ALPHA as glTex(Sub)Image2D parameter works. This
-// is tricky because GL_SRGB_ALPHA is valid in OpenGL ES but not valid in
-// OpenGL.
-TEST_F(GLEXTSRGBTest, TexImageSRGBALPHAFormat) {
-  if (!IsApplicable())
-    return;
-  static const int kWidth = 10;
-  static const int kHeight = 10;
-  static const int kSubImageX = kWidth / 2;
-  static const int kSubImageY = kHeight / 2;
-  static const int kSubImageWidth = kWidth / 2;
-  static const int kSubImageHeight = kHeight / 2;
-  static const uint8 kImageColor[] = {255, 255, 255, 255};
-  static const uint8 kSubImageColor[] = {128, 128, 128, 128};
-
-  uint8 pixels[kWidth * kHeight * 4];
-
-  GLuint tex = 0;
-  glGenTextures(1, &tex);
-  glBindTexture(GL_TEXTURE_2D, tex);
-  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-
-  memset(pixels, kImageColor[0], sizeof(pixels));
-  glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB_ALPHA_EXT, kWidth, kHeight, 0,
-               GL_SRGB_ALPHA_EXT, GL_UNSIGNED_BYTE, pixels);
-  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
-
-  memset(pixels, kSubImageColor[0], sizeof(pixels));
-  glTexSubImage2D(GL_TEXTURE_2D, 0, kSubImageX, kSubImageY, kSubImageWidth,
-                  kSubImageHeight, GL_SRGB_ALPHA_EXT, GL_UNSIGNED_BYTE, pixels);
-  EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
-  glBindTexture(GL_TEXTURE_2D, 0);
-  GLuint fbo = 0;
-  glGenFramebuffers(1, &fbo);
-  glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
-                         tex, 0);
-  EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
-            glCheckFramebufferStatus(GL_FRAMEBUFFER));
-
-  GLTestHelper::CheckPixels(0, 0, kWidth, kSubImageY, 0, kImageColor);
-  GLTestHelper::CheckPixels(0, 0, kSubImageX, kHeight, 0, kImageColor);
-  GLTestHelper::CheckPixels(kSubImageX, kSubImageY, kSubImageWidth,
-                            kSubImageHeight, 0, kSubImageColor);
-}
-}  // namespace gpu