Allow creating GLImage-backed textures with glTexStorage2D.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 8a114b4fe05ffa443364cd19e0957ca2d92673fc..b641ef29fc91261f2c8dffd10a7c8ec61ccafda1 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -1395,6 +1395,11 @@ void FeatureInfo::InitializeFeatures() {
   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");
+
+  if (!IsWebGLContext()) {
+    AddExtensionString("GL_CHROMIUM_texture_buffer");
+    validators_.texture_parameter.AddValue(GL_TEXTURE_BUFFER_USAGE_CHROMIUM);
+  }
 }
 
 void FeatureInfo::InitializeFloatAndHalfFloatFeatures(