Allow creating GLImage-backed textures with glTexStorage2D.

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 <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 1386 matching lines @@
   feature_flags_.angle_client_arrays =
       extensions.Contains("GL_ANGLE_client_arrays");
   feature_flags_.angle_request_extension =
       extensions.Contains("GL_ANGLE_request_extension");
   feature_flags_.ext_debug_marker = extensions.Contains("GL_EXT_debug_marker");
   feature_flags_.arb_robustness = extensions.Contains("GL_ARB_robustness");
   feature_flags_.khr_robustness = extensions.Contains("GL_KHR_robustness");
   feature_flags_.ext_robustness = extensions.Contains("GL_EXT_robustness");
   feature_flags_.chromium_texture_filtering_hint =
       extensions.Contains("GL_CHROMIUM_texture_filtering_hint");
+
+  if (!IsWebGLContext()) {
+    AddExtensionString("GL_CHROMIUM_texture_buffer");
+    feature_flags_.chromium_texture_buffer = true;
+    validators_.texture_parameter.AddValue(GL_TEXTURE_BUFFER_USAGE_CHROMIUM);
+  }
 }
 
 void FeatureInfo::InitializeFloatAndHalfFloatFeatures(
     const StringSet& extensions) {
   // Check if we should allow GL_OES_texture_float, GL_OES_texture_half_float,
   // GL_OES_texture_float_linear, GL_OES_texture_half_float_linear
   bool enable_texture_float = false;
   bool enable_texture_float_linear = false;
   bool enable_texture_half_float = false;
   bool enable_texture_half_float_linear = false;
@@ skipping 332 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu