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

gpu/command_buffer/client/vertex_array_object_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/client/vertex_array_object_manager.h"
 
 #include "base/logging.h"
 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
@@ skipping 264 matching lines @@
       break;
     case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
       *param = attrib->stride();
       break;
     case GL_VERTEX_ATTRIB_ARRAY_TYPE:
       *param = attrib->type();
       break;
     case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
       *param = attrib->normalized();
       break;
+    case GL_VERTEX_ATTRIB_ARRAY_INTEGER:
+      // TODO(zmo): cache this on the client side.

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

Same here, to implement this, we need to modify a few other commands' handling,
so I feel it's better to do it in a separate CL.

+      return false;
     default:
       return false;  // pass through to service side.
-      break;
   }
   return true;
 }
 
 void VertexArrayObject::SetAttribDivisor(GLuint index, GLuint divisor) {
   if (index < vertex_attribs_.size()) {
     VertexAttrib& attrib = vertex_attribs_[index];
     attrib.SetDivisor(divisor);
   }
 }
@@ skipping 327 matching lines @@
       function_name, gl, gl_helper, num_elements, primcount,
       &simulated_client_side_buffers);
   *simulated = *simulated || simulated_client_side_buffers;
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu