[CacheStorage] [DevTools] Added "Time Received" column to cache storage data grid

Screenshot of the change in the bug.

Since the entry response time is given as an internal UTC format, I added wrapper methods to Time.h to convert it to standard UTC format.

BUG=727922

Review-Url: https://codereview.chromium.org/2928833002
Cr-Commit-Position: refs/heads/master@{#478797}

third_party/WebKit/LayoutTests/http/tests/inspector/cache-storage/cache-storage-test.js

@@ -39,7 +39,11 @@ InspectorTest.dumpCacheTree = async function()
         }
         var dataGrid = view._dataGrid;
         for (var node of dataGrid.rootNode().children) {
-            var entries = Array.from(node.element().children, td => td.textContent).filter(text => text);
+            var children = Array.from(node.element().children).filter(function (element) {
+                // Removes timestamp, potential flake depending on time zone
+                return !(element.classList.contains("responseTime-column"));
+            });
+            var entries = Array.from(children, td => td.textContent).filter(text => text);
             InspectorTest.addResult("        " + entries.join(", "));
         }
     }

third_party/WebKit/Source/core/inspector/browser_protocol.json

@@ -1951,7 +1951,8 @@
                 "description": "Data entry.",
                 "properties": [
                     { "name": "request", "type": "string", "description": "Request url spec." },
-                    { "name": "response", "type": "string", "description": "Response stataus text." }
+                    { "name": "response", "type": "string", "description": "Response status text." },
+                    { "name": "responseTime", "type": "number", "description": "Number of seconds since epoch." }
                 ]
             },
             {

third_party/WebKit/Source/devtools/front_end/resources/ServiceWorkerCacheViews.js

@@ -36,7 +36,8 @@ Resources.ServiceWorkerCacheView = class extends UI.SimpleView {
   _createDataGrid() {
     var columns = /** @type {!Array<!DataGrid.DataGrid.ColumnDescriptor>} */ ([
       {id: 'number', title: Common.UIString('#'), width: '50px'}, {id: 'request', title: Common.UIString('Request')},
-      {id: 'response', title: Common.UIString('Response')}
+      {id: 'response', title: Common.UIString('Response')},
+      {id: 'responseTime', title: Common.UIString('Time Cached')}
     ]);
     var dataGrid = new DataGrid.DataGrid(
         columns, undefined, this._deleteButtonClicked.bind(this), this._updateData.bind(this, true));
@@ -110,6 +111,7 @@ Resources.ServiceWorkerCacheView = class extends UI.SimpleView {
       data['number'] = i + skipCount;
       data['request'] = entries[i].request;
       data['response'] = entries[i].response;
+      data['responseTime'] = entries[i].responseTime;
       var node = new DataGrid.DataGridNode(data);
       node.selectable = true;
       this._dataGrid.rootNode().appendChild(node);

third_party/WebKit/Source/devtools/front_end/sdk/ServiceWorkerCacheModel.js

@@ -223,7 +223,8 @@ SDK.ServiceWorkerCacheModel = class extends SDK.SDKModel {
       return;
     }
     var entries = response.cacheDataEntries.map(
-        dataEntry => new SDK.ServiceWorkerCacheModel.Entry(dataEntry.request, dataEntry.response));
+        dataEntry => new SDK.ServiceWorkerCacheModel.Entry(
+            dataEntry.request, dataEntry.response, new Date(dataEntry.responseTime * 1000).toLocaleString()));
     callback(entries, response.hasMore);
   }
 };
@@ -243,10 +244,12 @@ SDK.ServiceWorkerCacheModel.Entry = class {
   /**
    * @param {string} request
    * @param {string} response
+   * @param {string} responseTime
    */
-  constructor(request, response) {
+  constructor(request, response, responseTime) {
     this.request = request;
     this.response = response;
+    this.responseTime = responseTime;
   }
 };
 

third_party/WebKit/Source/modules/cachestorage/InspectorCacheStorageAgent.cpp

@@ -15,6 +15,7 @@
 #include "platform/wtf/PtrUtil.h"
 #include "platform/wtf/RefCounted.h"
 #include "platform/wtf/RefPtr.h"
+#include "platform/wtf/Time.h"
 #include "platform/wtf/Vector.h"
 #include "platform/wtf/text/StringBuilder.h"
 #include "public/platform/Platform.h"
@@ -165,6 +166,7 @@ struct RequestResponse {
       : request(request), response(response) {}
   String request;
   String response;
+  double response_time;
 };
 
 class ResponsesAccumulator : public RefCounted<ResponsesAccumulator> {
@@ -186,6 +188,8 @@ class ResponsesAccumulator : public RefCounted<ResponsesAccumulator> {
         responses_.at(responses_.size() - num_responses_left_);
     request_response.request = request.Url().GetString();
     request_response.response = response.StatusText();
+    request_response.response_time =
+        WTF::Time::FromInternalValue(response.ResponseTime()).ToDoubleT();
 
     if (--num_responses_left_ != 0)
       return;
@@ -208,6 +212,7 @@ class ResponsesAccumulator : public RefCounted<ResponsesAccumulator> {
           DataEntry::create()
               .setRequest(request_response.request)
               .setResponse(request_response.response)
+              .setResponseTime(request_response.response_time)
               .build();
       array->addItem(std::move(entry));
     }