Add ES3 commands GetVertexAttribI{u}iv to GPU command buffer.

gpu/command_buffer/service/vertex_attrib_manager.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/vertex_attrib_manager.h"
 
 #include <list>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 17 matching lines @@
 VertexAttrib::VertexAttrib()
     : index_(0),
       enabled_(false),
       size_(4),
       type_(GL_FLOAT),
       offset_(0),
       normalized_(GL_FALSE),
       gl_stride_(0),
       real_stride_(16),
       divisor_(0),
+      integer_(GL_FALSE),

[Zhenyao Mo, 2015/05/08 22:20:56]

We don't have a path to set this to true in this CL.  I decided to do it in a
followup CL because that requires interaction with a bunch of other commands'
handling.

       is_client_side_array_(false),
       list_(NULL) {
 }
 
 VertexAttrib::~VertexAttrib() {
 }
 
 void VertexAttrib::SetInfo(
     Buffer* buffer,
     GLint size,
@@ skipping 221 matching lines @@
   if (current_buffer_id != kInitialBufferId) {
     // Restore the buffer binding.
     decoder->RestoreBufferBindings();
   }
 
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu