Remove transform feedback validation in Blink

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 3751 matching lines @@
     }
   }
 }
 
 void GLES2DecoderImpl::DeleteTransformFeedbacksHelper(
     GLsizei n, const GLuint* client_ids) {
   for (GLsizei ii = 0; ii < n; ++ii) {
     TransformFeedback* transform_feedback = GetTransformFeedback(
         client_ids[ii]);
     if (transform_feedback) {
+      if (transform_feedback->active()) {
+        LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION, "glDeleteTransformFeedbacks",
+                           "Deleting transform feedback is active");
+        return;
+      }
       if (state_.bound_transform_feedback.get() == transform_feedback) {
         // Bind to the default transform feedback.
         DCHECK(state_.default_transform_feedback.get());
         state_.default_transform_feedback->DoBindTransformFeedback(
             GL_TRANSFORM_FEEDBACK);
         state_.bound_transform_feedback =
             state_.default_transform_feedback.get();
       }
       RemoveTransformFeedback(client_ids[ii]);
     }
@@ skipping 1973 matching lines @@
               GetFramebufferInfoForTarget(GL_READ_FRAMEBUFFER);
           GLenum read_buffer;
           if (framebuffer) {
             read_buffer = framebuffer->read_buffer();
           } else {
             read_buffer = back_buffer_read_buffer_;
           }
           *params = static_cast<GLint>(read_buffer);
         }
         return true;
+      case GL_TRANSFORM_FEEDBACK_ACTIVE:
+        *num_written = 1;
+        if (params) {
+          *params =
+              static_cast<GLint>(state_.bound_transform_feedback->active());
+        }
+        return true;
+      case GL_TRANSFORM_FEEDBACK_PAUSED:
+        *num_written = 1;
+        if (params) {
+          *params =
+              static_cast<GLint>(state_.bound_transform_feedback->paused());
+        }
+        return true;
     }
   }
   switch (pname) {
     case GL_MAX_VIEWPORT_DIMS:
       if (offscreen_target_frame_buffer_.get()) {
         *num_written = 2;
         if (params) {
           params[0] = renderbuffer_manager()->max_renderbuffer_size();
           params[1] = renderbuffer_manager()->max_renderbuffer_size();
         }
@@ skipping 11198 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu