gpu: Add async upload functions.

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
@@ skipping 217 matching lines @@
           switches::kDisableGpuDriverBugWorkarounds);
 
   feature_flags_.enable_shader_name_hashing =
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableShaderNameHashing);
 
 
   bool npot_ok = false;
 
   AddExtensionString("GL_ANGLE_translated_shader_source");
+  AddExtensionString("GL_CHROMIUM_async_tasks");

[greggman, 2012/11/29 02:18:18]

Seems like this should maybe be more specific. Like
GL_CHROMIUM_asycn_texture_upload?

What do you think?

[epennerAtGoogle, 2012/11/29 03:47:23]

It was like that before, but I plan to add Async readbacks as well. Although I
could make them separate:
- GL_CHROMIUM_async_texture_upload
- GL_CHROMIUM_async_texture_readbacks.
I have a very weak preference to keep it as just one. Whichever you think is
best.

[reveman, 2012/11/29 04:13:32]

"task" is a bit ambiguous. if use one extension maybe
CHROMIUM_async_pixel_transfer?

also not sure async is a good description. makes it seem like standard texture
uploads are synchronous. maybe CHROMIUM_idle_pixel_transfer or 
CHROMIUM_unsequenced_pixel_transfer is better?

[epennerAtGoogle, 2012/11/29 19:28:43]

I like async-pixel-transfer the most, so I'll use that unless there is another
preference. Similarly I'll use async-pixel-transfers-completed for the query.

   AddExtensionString("GL_CHROMIUM_bind_uniform_location");
   AddExtensionString("GL_CHROMIUM_command_buffer_query");
   AddExtensionString("GL_CHROMIUM_command_buffer_latency_query");
   AddExtensionString("GL_CHROMIUM_copy_texture");
   AddExtensionString("GL_CHROMIUM_discard_framebuffer");
   AddExtensionString("GL_CHROMIUM_get_error_query");
   AddExtensionString("GL_CHROMIUM_pixel_transfer_buffer_object");
   AddExtensionString("GL_CHROMIUM_rate_limit_offscreen_context");
   AddExtensionString("GL_CHROMIUM_resize");
   AddExtensionString("GL_CHROMIUM_resource_safe");
@@ skipping 452 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu