Move code in ui/gl/* from gfx:: to gl::

ui/gl/trace_util.h

 // 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.
 
 #ifndef UI_GL_TRACE_UTIL_H_
 #define UI_GL_TRACE_UTIL_H_
 
 #include <stdint.h>
 
 #include "base/trace_event/memory_allocator_dump.h"
 #include "ui/gl/gl_export.h"
 
-namespace gfx {
+namespace gl {
 
 GL_EXPORT base::trace_event::MemoryAllocatorDumpGuid
 GetGLTextureClientGUIDForTracing(uint64_t share_group_guid,
                                  uint32_t texture_client_id);
 
 GL_EXPORT base::trace_event::MemoryAllocatorDumpGuid
 GetGLRenderbufferGUIDForTracing(uint64_t share_group_guid,
                                 uint32_t renderbuffer_id);
 
 GL_EXPORT base::trace_event::MemoryAllocatorDumpGuid
 GetGLTextureServiceGUIDForTracing(uint64_t share_group_guid,
                                   uint32_t texture_service_id);
 
 GL_EXPORT base::trace_event::MemoryAllocatorDumpGuid GetGLBufferGUIDForTracing(
     uint64_t share_group_guid,
     uint32_t buffer_id);
 
 }  // namespace ui
 
 #endif  // UI_GL_TRACE_UTIL_H_