Re-enable GPU-GPU copies of video textures to GL_RED

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 4860 matching lines @@
                                                     GLenum type) {
 #if defined(OS_MACOSX)
   // RGB5_A1 is not color-renderable on NVIDIA Mac, see crbug.com/676209.
   // Though, glCopyTextureCHROMIUM can handle RGB5_A1 internalformat by doing a
   // fallback path, but it doesn't know the type info. So, we still cannot do
   // the fallback path in glCopyTextureCHROMIUM for
   // RGBA/RGBA/UNSIGNED_SHORT_5_5_5_1 format and type combination.
   if (type == GL_UNSIGNED_SHORT_5_5_5_1)
     return false;
 #endif
-  // TODO(kbr): bugs were observed when using CopyTextureCHROMIUM to
-  // copy hardware-accelerated video textures to red-channel textures.
-  // These bugs were seen on macOS but may indicate more general
-  // problems. Investigate the root cause of this and fix it.
-  // crbug.com/710673
-  if (format == GL_RED || format == GL_RED_INTEGER)
-    return false;
 
 #if defined(OS_ANDROID)
   // TODO(kbr): bugs were seen on Android devices with NVIDIA GPUs
   // when copying hardware-accelerated video textures to
   // floating-point textures. Investigate the root cause of this and
   // fix it. crbug.com/710874
   if (type == GL_FLOAT)
     return false;
 #endif
 
@@ skipping 2889 matching lines @@
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(
     HTMLCanvasElementOrOffscreenCanvas& result) const {
   if (canvas()) {
     result.setHTMLCanvasElement(static_cast<HTMLCanvasElement*>(host()));
   } else {
     result.setOffscreenCanvas(static_cast<OffscreenCanvas*>(host()));
   }
 }
 
 }  // namespace blink