Add a mechanism for command buffer to conditionally allow ES3 enums.

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 1034 matching lines @@
     }
   }
 
 #if !defined(OS_MACOSX)
   if (workarounds_.ignore_egl_sync_failures) {
     gfx::GLFenceEGL::SetIgnoreFailures();
   }
 #endif
 }
 
+bool FeatureInfo::IsES3Capable() const {
+  if (gl_version_info_->IsAtLeastGLES(3, 0))
+    return true;
+  // TODO(zmo): For Desktop GL, with anything lower than 4.2, we need to check
+  // the existence of a few extensions to have full WebGL 2 capabilities.
+  if (gl_version_info_->IsAtLeastGL(4, 2))
+    return true;
+#if defined(OS_MACOSX)
+  // TODO(zmo): For experimentation purpose  on MacOSX with core profile,
+  // allow 3.2 or plus for now.
+  if (gl_version_info_->IsAtLeastGL(3, 2))
+    return true;
+#endif
+  return false;
+}
+
+void FeatureInfo::EnableES3Validators() {
+  DCHECK(IsES3Capable());
+  validators_.AddES3Values();
+}
+
 void FeatureInfo::AddExtensionString(const char* s) {
   std::string str(s);
   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