gpu: Make glTexSubImage2D work with GL_SRGB_ALPHA on OpenGL

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 4e5aefe46e4aba8aacafa2e6e8a804ddc8ec410e..5a548d0e8f151cf15bf35734c0df79cc1662b560 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -501,9 +501,10 @@ void FeatureInfo::InitializeFeatures() {
   // sized formats GL_SRGB8 and GL_SRGB8_ALPHA8. Also, SRGB_EXT isn't a valid
   // <format> in this case. So, even with GLES3 explicitly check for
   // GL_EXT_sRGB.
-  if (((gl_version_info_->is_es3 ||
-        extensions.Contains("GL_OES_rgb8_rgba8")) &&
-      extensions.Contains("GL_EXT_sRGB")) || gfx::HasDesktopGLFeatures()) {
+  if (!workarounds_.disable_ext_srgb &&
+      (((gl_version_info_->is_es3 ||
+         extensions.Contains("GL_OES_rgb8_rgba8")) &&
+        extensions.Contains("GL_EXT_sRGB")) || gfx::HasDesktopGLFeatures())) {
     AddExtensionString("GL_EXT_sRGB");
     validators_.texture_internal_format.AddValue(GL_SRGB_EXT);
     validators_.texture_internal_format.AddValue(GL_SRGB_ALPHA_EXT);