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diff --git a/vendor/go.opencensus.io/stats/view/aggregation.go b/vendor/go.opencensus.io/stats/view/aggregation.go
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+// Copyright 2017, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package view
+
+// AggType represents the type of aggregation function used on a View.
+type AggType int
+
+// All available aggregation types.
+const (
+        AggTypeNone         AggType = iota // no aggregation; reserved for future use.
+        AggTypeCount                       // the count aggregation, see Count.
+        AggTypeSum                         // the sum aggregation, see Sum.
+        AggTypeDistribution                // the distribution aggregation, see Distribution.
+        AggTypeLastValue                   // the last value aggregation, see LastValue.
+)
+
+func (t AggType) String() string {
+        return aggTypeName[t]
+}
+
+var aggTypeName = map[AggType]string{
+        AggTypeNone:         "None",
+        AggTypeCount:        "Count",
+        AggTypeSum:          "Sum",
+        AggTypeDistribution: "Distribution",
+        AggTypeLastValue:    "LastValue",
+}
+
+// Aggregation represents a data aggregation method. Use one of the functions:
+// Count, Sum, or Distribution to construct an Aggregation.
+type Aggregation struct {
+        Type    AggType   // Type is the AggType of this Aggregation.
+        Buckets []float64 // Buckets are the bucket endpoints if this Aggregation represents a distribution, see Distribution.
+
+        newData func() AggregationData
+}
+
+var (
+        aggCount = &Aggregation{
+                Type: AggTypeCount,
+                newData: func() AggregationData {
+                        return &CountData{}
+                },
+        }
+        aggSum = &Aggregation{
+                Type: AggTypeSum,
+                newData: func() AggregationData {
+                        return &SumData{}
+                },
+        }
+)
+
+// Count indicates that data collected and aggregated
+// with this method will be turned into a count value.
+// For example, total number of accepted requests can be
+// aggregated by using Count.
+func Count() *Aggregation {
+        return aggCount
+}
+
+// Sum indicates that data collected and aggregated
+// with this method will be summed up.
+// For example, accumulated request bytes can be aggregated by using
+// Sum.
+func Sum() *Aggregation {
+        return aggSum
+}
+
+// Distribution indicates that the desired aggregation is
+// a histogram distribution.
+//
+// An distribution aggregation may contain a histogram of the values in the
+// population. The bucket boundaries for that histogram are described
+// by the bounds. This defines len(bounds)+1 buckets.
+//
+// If len(bounds) >= 2 then the boundaries for bucket index i are:
+//
+//     [-infinity, bounds[i]) for i = 0
+//     [bounds[i-1], bounds[i]) for 0 < i < length
+//     [bounds[i-1], +infinity) for i = length
+//
+// If len(bounds) is 0 then there is no histogram associated with the
+// distribution. There will be a single bucket with boundaries
+// (-infinity, +infinity).
+//
+// If len(bounds) is 1 then there is no finite buckets, and that single
+// element is the common boundary of the overflow and underflow buckets.
+func Distribution(bounds ...float64) *Aggregation {
+        return &Aggregation{
+                Type:    AggTypeDistribution,
+                Buckets: bounds,
+                newData: func() AggregationData {
+                        return newDistributionData(bounds)
+                },
+        }
+}
+
+// LastValue only reports the last value recorded using this
+// aggregation. All other measurements will be dropped.
+func LastValue() *Aggregation {
+        return &Aggregation{
+                Type: AggTypeLastValue,
+                newData: func() AggregationData {
+                        return &LastValueData{}
+                },
+        }
+}