gpu: Add TransformFeedback & Uniform Buffer related consts

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 645522a775343ebe1a8cf4a661c46a12dff51748..2651741c06e39b29250b316a03222f18afb5be1e 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -2837,6 +2837,14 @@ Capabilities GLES2DecoderImpl::GetCapabilities() {
   DoGetIntegerv(GL_NUM_SHADER_BINARY_FORMATS, &caps.num_shader_binary_formats);
   DoGetIntegerv(GL_BIND_GENERATES_RESOURCE_CHROMIUM,
                 &caps.bind_generates_resource_chromium);
+  if (unsafe_es3_apis_enabled()) {
+    DoGetIntegerv(GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
+                  &caps.max_transform_feedback_separate_attribs);
+    DoGetIntegerv(GL_MAX_UNIFORM_BUFFER_BINDINGS,
+                  &caps.max_uniform_buffer_bindings);
+    DoGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT,
+                  &caps.uniform_buffer_offset_alignment);
+  }
 
   caps.egl_image_external =
       feature_info_->feature_flags().oes_egl_image_external;