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 922 matching lines @@
   void pixelStorei(GLenum pname, GLint param) override;
   void readPixels(GLint x,
                   GLint y,
                   GLsizei width,
                   GLsizei height,
                   GLenum format,
                   GLenum type,
                   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 116 matching lines @@
 
   void renderbufferStorageHelper(GLenum target,
                                  GLsizei samples,
                                  GLenum internalformat,
                                  GLsizei width,
                                  GLsizei height,
                                  const char* functionName);
 
   TraceWrapperMember<WebGLFramebuffer> m_readFramebufferBinding;
   TraceWrapperMember<WebGLTransformFeedback> m_transformFeedbackBinding;
+  // This instance isn't exposed to JavaScript, which is why it's a
+  // Member rather than TraceWrapperMember.
+  Member<WebGLTransformFeedback> m_defaultTransformFeedback;
 
   std::set<GLenum> m_supportedInternalFormatsStorage;
   std::set<GLenum> m_compressedTextureFormatsETC2EAC;
 
   TraceWrapperMember<WebGLBuffer> m_boundCopyReadBuffer;
   TraceWrapperMember<WebGLBuffer> m_boundCopyWriteBuffer;
   TraceWrapperMember<WebGLBuffer> m_boundPixelPackBuffer;
   TraceWrapperMember<WebGLBuffer> m_boundPixelUnpackBuffer;
-  TraceWrapperMember<WebGLBuffer> m_boundTransformFeedbackBuffer;
   TraceWrapperMember<WebGLBuffer> m_boundUniformBuffer;
 
-  HeapVector<TraceWrapperMember<WebGLBuffer>>
-      m_boundIndexedTransformFeedbackBuffers;
   HeapVector<TraceWrapperMember<WebGLBuffer>> m_boundIndexedUniformBuffers;
   GLint m_maxTransformFeedbackSeparateAttribs;
   size_t m_maxBoundUniformBufferIndex;
 
   TraceWrapperMember<WebGLQuery> m_currentBooleanOcclusionQuery;
   TraceWrapperMember<WebGLQuery>
       m_currentTransformFeedbackPrimitivesWrittenQuery;
   TraceWrapperMember<WebGLQuery> m_currentElapsedQuery;
   HeapVector<TraceWrapperMember<WebGLSampler>> m_samplerUnits;
 
@@ skipping 15 matching lines @@
                   context,
                   context->is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(context) >= 2,
                   context.is3d() &&
                       WebGLRenderingContextBase::getWebGLVersion(&context) >=
                           2);
 
 }  // namespace blink
 
 #endif