Remove references to build in pipeline charts

Being the good boyscouts, but mainly because of [the comment in the
review](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12378#note_33302115)
the words used for classes and variables are changed to not use builds
anymore.

app/controllers/projects/pipelines_controller.rb

@@ -135,7 +135,7 @@ class Projects::PipelinesController < Projects::ApplicationController
     @charts[:week] = Ci::Charts::WeekChart.new(project)
     @charts[:month] = Ci::Charts::MonthChart.new(project)
     @charts[:year] = Ci::Charts::YearChart.new(project)
-    @charts[:build_times] = Ci::Charts::BuildTime.new(project)
+    @charts[:pipeline_times] = Ci::Charts::PipelineTime.new(project)
 
     @counts = {}
     @counts[:total] = @project.pipelines.count(:all)

app/helpers/graph_helper.rb

@@ -17,10 +17,10 @@ module GraphHelper
     ids.zip(parent_spaces)
   end
 
-  def success_ratio(success:, failed:)
-    return 100 if failed.zero?
+  def success_ratio(counts)
+    return 100 if counts[:failed].zero?
 
-    ratio = (success.to_f / (success + failed)) * 100
+    ratio = (counts[:success].to_f / (counts[:success] + counts[:failed])) * 100
     ratio.to_i
   end
 end

app/views/projects/pipelines/charts.html.haml

@@ -15,7 +15,7 @@
       .col-md-6
         = render 'projects/pipelines/charts/overall'
       .col-md-6
-        = render 'projects/pipelines/charts/build_times'
+        = render 'projects/pipelines/charts/pipeline_times'
 
     %hr
-    = render 'projects/pipelines/charts/builds'
+    = render 'projects/pipelines/charts/pipelines'

app/views/projects/pipelines/charts/_build_times.haml → app/views/projects/pipelines/charts/_pipeline_times.haml

@@ -6,7 +6,7 @@
 
 :javascript
   var data = {
-    labels : #{@charts[:build_times].labels.to_json},
+    labels : #{@charts[:pipeline_times].labels.to_json},
     datasets : [
       {
         fillColor : "rgba(220,220,220,0.5)",
@@ -14,7 +14,7 @@
         barStrokeWidth: 1,
         barValueSpacing: 1,
         barDatasetSpacing: 1,
-        data : #{@charts[:build_times].build_times.to_json}
+        data : #{@charts[:pipeline_times].pipeline_times.to_json}
       }
     ]
   }

lib/ci/charts.rb

@@ -33,13 +33,13 @@ module Ci
     end
 
     class Chart
-      attr_reader :labels, :total, :success, :project, :build_times
+      attr_reader :labels, :total, :success, :project, :pipeline_times
 
       def initialize(project)
         @labels = []
         @total = []
         @success = []
-        @build_times = []
+        @pipeline_times = []
         @project = project
 
         collect
@@ -101,14 +101,14 @@ module Ci
       end
     end
 
-    class BuildTime < Chart
+    class PipelineTime < Chart
       def collect
         commits = project.pipelines.last(30)
 
         commits.each do |commit|
           @labels << commit.short_sha
           duration = commit.duration || 0
-          @build_times << (duration / 60)
+          @pipeline_times << (duration / 60)
         end
       end
     end

spec/lib/ci/charts_spec.rb

 require 'spec_helper'
 
 describe Ci::Charts, lib: true do
-  context "build_times" do
+  context "pipeline_times" do
     let(:project) { create(:empty_project) }
-    let(:chart) { Ci::Charts::BuildTime.new(project) }
+    let(:chart) { Ci::Charts::PipelineTime.new(project) }
 
-    subject { chart.build_times }
+    subject { chart.pipeline_times }
 
     before do
       create(:ci_empty_pipeline, project: project, duration: 120)
     end
 
-    it 'returns build times in minutes' do
+    it 'returns pipeline times in minutes' do
       is_expected.to contain_exactly(2)
     end
 
-    it 'handles nil build times' do
+    it 'handles nil pipeline times' do
       create(:ci_empty_pipeline, project: project, duration: nil)
 
       is_expected.to contain_exactly(2, 0)