Re-land: gpu: Add CHROMIUM_sync_query extension.

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/macros.h"
@@ skipping 116 matching lines @@
       enable_samplers(false),
       ext_draw_buffers(false),
       ext_frag_depth(false),
       use_async_readpixels(false),
       map_buffer_range(false),
       ext_discard_framebuffer(false),
       angle_depth_texture(false),
       is_angle(false),
       is_swiftshader(false),
       angle_texture_usage(false),
-      ext_texture_storage(false) {
-}
+      ext_texture_storage(false),
+      arb_sync(false) {}
 
 FeatureInfo::Workarounds::Workarounds() :
 #define GPU_OP(type, name) name(false),
     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
 #undef GPU_OP
     max_texture_size(0),
     max_cube_map_texture_size(0) {
 }
 
 FeatureInfo::FeatureInfo() {
@@ skipping 90 matching lines @@
   AddExtensionString("GL_CHROMIUM_command_buffer_query");
   AddExtensionString("GL_CHROMIUM_command_buffer_latency_query");
   AddExtensionString("GL_CHROMIUM_copy_texture");
   AddExtensionString("GL_CHROMIUM_get_error_query");
   AddExtensionString("GL_CHROMIUM_lose_context");
   AddExtensionString("GL_CHROMIUM_pixel_transfer_buffer_object");
   AddExtensionString("GL_CHROMIUM_rate_limit_offscreen_context");
   AddExtensionString("GL_CHROMIUM_resize");
   AddExtensionString("GL_CHROMIUM_resource_safe");
   AddExtensionString("GL_CHROMIUM_strict_attribs");
+  AddExtensionString("GL_CHROMIUM_sync_query");
   AddExtensionString("GL_CHROMIUM_texture_mailbox");
   AddExtensionString("GL_EXT_debug_marker");
 
   // OES_vertex_array_object is emulated if not present natively,
   // so the extension string is always exposed.
   AddExtensionString("GL_OES_vertex_array_object");
 
   if (!disallowed_features_.gpu_memory_manager)
     AddExtensionString("GL_CHROMIUM_gpu_memory_manager");
 
@@ skipping 511 matching lines @@
     // TODO(dsinclair): Add AddExtensionString("GL_CHROMIUM_sampler_objects")
     // when available.
   }
 
   if ((is_es3 || extensions.Contains("GL_EXT_discard_framebuffer")) &&
       !workarounds_.disable_ext_discard_framebuffer) {
     // DiscardFramebufferEXT is automatically bound to InvalidateFramebuffer.
     AddExtensionString("GL_EXT_discard_framebuffer");
     feature_flags_.ext_discard_framebuffer = true;
   }
+
+  if (is_es3 || extensions.Contains("GL_ARB_sync"))
+    feature_flags_.arb_sync = true;

[no sievers, 2014/04/15 18:41:15]

I missed that es3 has this.
We should update gl_fence.cc to use this on es3 (also |ui_gl_fence_works|
above).

 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {
   size_t pos = extensions_.find(str);
   while (pos != std::string::npos &&
          pos + str.length() < extensions_.length() &&
          extensions_.substr(pos + str.length(), 1) != " ") {
     // This extension name is a substring of another.
     pos = extensions_.find(str, pos + str.length());
   }
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu