16-bit video upload to float: intermediate R16_EXT and copy to float.

third_party/WebKit/Source/core/html/HTMLVideoElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 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 67 matching lines @@
   // The caller is responsible for allocating the destination texture.
   bool CopyVideoTextureToPlatformTexture(gpu::gles2::GLES2Interface*,
                                          GLuint texture,
                                          bool premultiply_alpha,
                                          bool flip_y);
 
   // Used by WebGL to do CPU-GPU texture upload if possible.
   bool TexImageImpl(WebMediaPlayer::TexImageFunctionID,
                     GLenum target,
                     gpu::gles2::GLES2Interface*,
+                    GLuint texture,
                     GLint level,
                     GLint internalformat,
                     GLenum format,
                     GLenum type,
                     GLint xoffset,
                     GLint yoffset,
                     GLint zoffset,
                     bool flip_y,
                     bool premultiply_alpha);
 
@@ skipping 62 matching lines @@
       custom_controls_fullscreen_detector_;
 
   AtomicString default_poster_url_;
 
   bool is_persistent_ = false;
 };
 
 }  // namespace blink
 
 #endif  // HTMLVideoElement_h