[DevTools] Implementation of resource requests blocked by specific urls.

Source/devtools/front_end/network/networkPanel.css

Index: Source/devtools/front_end/network/networkPanel.css
diff --git a/Source/devtools/front_end/network/networkPanel.css b/Source/devtools/front_end/network/networkPanel.css
index 071ce02cf8a715e9d13c8fcbd3d391221d8dade2..a9637c8503d41554eeba3559aeb27796cce3b725 100644
--- a/Source/devtools/front_end/network/networkPanel.css
+++ b/Source/devtools/front_end/network/networkPanel.css
@@ -229,3 +229,39 @@
     border-bottom: solid 1px #cdcdcd;
     flex: none !important;
 }
+
+.blocked-urls-bar {
+    background-color: #f3f3f3;
+    flex: none;
+    border-bottom: 1px solid #dadada;
+    flex-wrap: wrap;
+    max-height: 127px;
+    overflow-y: auto;
+    overflow-x: hidden;
+}
+
+.blocked-urls-bar .blocked-url-container {
+    display: inline-flex;
+    padding: 2px;
+    margin: 2px;
+    background-color: #dadada;
+}
+
+.blocked-urls-bar .blocked-url-text {
+    max-width: 140px;
+    margin-right: 5px;
+    overflow: hidden;
+    flex: none;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.blocked-urls-bar .blocked-urls-empty {
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    overflow: hidden;
+    height: 24px;
+    display: flex;
+    align-items: center;
+    padding: 5px;
+}