test-results: Add merge and trim methods

go/src/infra/appengine/test-results/model/full_result_test.go

 package model
 
 import (
         "encoding/json"
         "testing"
 
         . "github.com/smartystreets/goconvey/convey"
 )
 
 func TestFullResult(t *testing.T) {
@@ skipping 101 matching lines @@
                                                         "baz": AggregateTest{
                                                                 "qux": AggregateTest{
                                                                         "baaz": &AggregateTestLeaf{
                                                                                 Results:  []ResultSummary{{1, "C"}},
                                                                                 Runtimes: []RuntimeSummary{{1, 0}},
                                                                                 Expected: []string{"CRASH", "AUDIO"},
                                                                         },
                                                                 },
                                                                 "baax": &AggregateTestLeaf{
                                                                         Results:  []ResultSummary{{1, "PAC"}},
-                                                                        Runtimes: []RuntimeSummary{{1, 20.9}},
+                                                                        Runtimes: []RuntimeSummary{{1, 21}},
                                                                         Expected: []string{"PASS", "CRASH"},
                                                                         Bugs:     []string{"crbug.com/700", "crbug.com/900"},
                                                                 },
                                                         },
                                                 },
                                                 FailuresByType: map[string][]int{
                                                         "A": {5},
                                                         "Q": {11},
                                                 },
                                                 ChromeRevs: []string{"45000"},
                                         },
                                 })
                         })
                 })
         })
 }