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

gpu/command_buffer/service/context_state.cc

Index: gpu/command_buffer/service/context_state.cc
diff --git a/gpu/command_buffer/service/context_state.cc b/gpu/command_buffer/service/context_state.cc
index 5c5da8275053b1abfc106abf9dea885472572854..d4bb31ec50de5f13d7ba0268a00892cafeded692 100644
--- a/gpu/command_buffer/service/context_state.cc
+++ b/gpu/command_buffer/service/context_state.cc
@@ -185,7 +185,35 @@ void ContextState::RestoreActiveTextureUnitBinding(unsigned int target) const {
 void ContextState::RestoreVertexAttribValues() const {
   for (size_t attrib = 0; attrib < vertex_attrib_manager->num_attribs();
        ++attrib) {
-    glVertexAttrib4fv(attrib, attrib_values[attrib].v);
+    switch (attrib_values[attrib].type) {
+      case Vec4::kFloat:
+        {
+          GLfloat v[4];
+          for (size_t ii = 0; ii < 4; ++ii) {
+            v[ii] = static_cast<GLfloat>(attrib_values[attrib].v[ii]);
+          }
+          glVertexAttrib4fv(attrib, v);
+        }
+        break;
+      case Vec4::kInt:
+        {
+          GLint v[4];
+          for (size_t ii = 0; ii < 4; ++ii) {
+            v[ii] = static_cast<GLint>(attrib_values[attrib].v[ii]);
+          }
+          glVertexAttribI4iv(attrib, v);
+        }
+        break;
+      case Vec4::kUInt:
+        {
+          GLuint v[4];
+          for (size_t ii = 0; ii < 4; ++ii) {
+            v[ii] = static_cast<GLuint>(attrib_values[attrib].v[ii]);
+          }
+          glVertexAttribI4uiv(attrib, v);
+        }
+        break;
+    }
   }
 }