Fix state management of transform feedback buffers.

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h

 // Copyright 2015 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.
 
 #ifndef WebGL2RenderingContextBase_h
 #define WebGL2RenderingContextBase_h
 
 #include "bindings/core/v8/TraceWrapperMember.h"
 #include "modules/webgl/WebGLExtension.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
@@ skipping 954 matching lines @@
   void pixelStorei(GLenum pname, GLint param) override;
   void readPixels(GLint x,
                   GLint y,
                   GLsizei width,
                   GLsizei height,
                   GLenum format,
                   GLenum type,
                   MaybeShared<DOMArrayBufferView> pixels) override;
   void RestoreCurrentFramebuffer() override;
 
+  /* Helpers */
+  GLint GetMaxTransformFeedbackSeparateAttribs() const;
+
   DECLARE_VIRTUAL_TRACE();
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  protected:
   friend class V8WebGL2RenderingContext;
   friend class WebGLGetBufferSubDataAsync;
 
   WebGL2RenderingContextBase(
       HTMLCanvasElement*,
       std::unique_ptr<WebGraphicsContext3DProvider>,
@@ skipping 114 matching lines @@
 
   void RenderbufferStorageHelper(GLenum target,
                                  GLsizei samples,
                                  GLenum internalformat,
                                  GLsizei width,
                                  GLsizei height,
                                  const char* function_name);
 
   TraceWrapperMember<WebGLFramebuffer> read_framebuffer_binding_;
   TraceWrapperMember<WebGLTransformFeedback> transform_feedback_binding_;
+  // This instance isn't exposed to JavaScript, which is why it's a
+  // Member rather than TraceWrapperMember.
+  Member<WebGLTransformFeedback> default_transform_feedback_;
 
   std::set<GLenum> supported_internal_formats_storage_;
   std::set<GLenum> compressed_texture_formats_etc2eac_;
 
   TraceWrapperMember<WebGLBuffer> bound_copy_read_buffer_;
   TraceWrapperMember<WebGLBuffer> bound_copy_write_buffer_;
   TraceWrapperMember<WebGLBuffer> bound_pixel_pack_buffer_;
   TraceWrapperMember<WebGLBuffer> bound_pixel_unpack_buffer_;
-  TraceWrapperMember<WebGLBuffer> bound_transform_feedback_buffer_;
   TraceWrapperMember<WebGLBuffer> bound_uniform_buffer_;
 
-  HeapVector<TraceWrapperMember<WebGLBuffer>>
-      bound_indexed_transform_feedback_buffers_;
   HeapVector<TraceWrapperMember<WebGLBuffer>> bound_indexed_uniform_buffers_;
   GLint max_transform_feedback_separate_attribs_;
   size_t max_bound_uniform_buffer_index_;
 
   TraceWrapperMember<WebGLQuery> current_boolean_occlusion_query_;
   TraceWrapperMember<WebGLQuery>
       current_transform_feedback_primitives_written_query_;
   TraceWrapperMember<WebGLQuery> current_elapsed_query_;
   HeapVector<TraceWrapperMember<WebGLSampler>> sampler_units_;
 
@@ skipping 15 matching lines @@
                   context,
                   context->Is3d() &&
                       WebGLRenderingContextBase::GetWebGLVersion(context) >= 2,
                   context.Is3d() &&
                       WebGLRenderingContextBase::GetWebGLVersion(&context) >=
                           2);
 
 }  // namespace blink
 
 #endif