Fix transform feedback bugs

gpu/command_buffer/client/gles2_implementation.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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
@@ skipping 3802 matching lines @@
 void GLES2Implementation::BindBufferStub(GLenum target, GLuint buffer) {
   helper_->BindBuffer(target, buffer);
   if (share_group_->bind_generates_resource())
     helper_->CommandBufferHelper::OrderingBarrier();
 }
 
 void GLES2Implementation::BindBufferBaseHelper(
     GLenum target, GLuint index, GLuint buffer_id) {
   // TODO(zmo): See note #1 above.
   // TODO(zmo): See note #2 above.
+  switch (target) {

[Zhenyao Mo, 2016/03/02 17:09:36]

You will need to validate index before caching the binding.

[qiankun, 2016/03/03 10:14:15]

Done.

+    case GL_TRANSFORM_FEEDBACK_BUFFER:
+      if (bound_transform_feedback_buffer_ != buffer_id) {
+        bound_transform_feedback_buffer_ = buffer_id;
+      }
+      break;
+    case GL_UNIFORM_BUFFER:
+      if (bound_uniform_buffer_ != buffer_id) {
+        bound_uniform_buffer_ = buffer_id;
+      }
+      break;
+    default:
+      break;
+  }
   GetIdHandler(id_namespaces::kBuffers)->MarkAsUsedForBind(
       this, target, index, buffer_id, &GLES2Implementation::BindBufferBaseStub);
 }
 
 void GLES2Implementation::BindBufferBaseStub(
     GLenum target, GLuint index, GLuint buffer) {
   helper_->BindBufferBase(target, index, buffer);
   if (share_group_->bind_generates_resource())
     helper_->CommandBufferHelper::Flush();
 }
@@ skipping 2714 matching lines @@
   CheckGLError();
 }
 
 // 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 "gpu/command_buffer/client/gles2_implementation_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu