MD WebUI: Center search field correctly inside cr-toolbar

ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html

Index: ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html
diff --git a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html
index a50b7853ada9a5c9a7a805dcc76654b82bf82f16..18bdd151e36f81a37997af58ab01eb28a3014722 100644
--- a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html
+++ b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html
@@ -7,6 +7,7 @@
   <template>
     <style>
       :host {
+        --cr-toolbar-field-width: 580px;
         color: #fff;
         display: flex;
         height: 56px;
@@ -16,11 +17,17 @@
         @apply(--layout-flex);
         font-size: 123%;
         font-weight: 400;
+        text-overflow: ellipsis;

[dpapad, 2016/07/14 16:47:28]

Could those be moved under #leftContent instead of host?

[tsergeant, 2016/07/15 01:35:46]

Do you mean "instead of h1"?

Playing around with it, these are necessary here, but we can get rid of the
overflow:hidden on #leftContent.

+        overflow: hidden;
+        white-space: nowrap;
       }
 
       #leftContent {
         align-items: center;
         display: flex;
+        overflow: hidden;
+        position: absolute;
+        transition: opacity 100ms;
       }
 
       #leftContent paper-icon-button {
@@ -41,12 +48,16 @@
         justify-content: center;
       }
 
+      :host(:not([narrow_])) #leftContent {
+        max-width: calc((100% - var(--cr-toolbar-field-width) - 18px) / 2);

[dpapad, 2016/07/14 16:47:28]

Nice! I am glad calc() can help us here.

+      }
+
       :host([narrow_]) #centeredContent {
         justify-content: flex-end;
       }
 
       :host([narrow_][showing-search_]) #leftContent {
-        display: none;
+        opacity: 0;
       }
     </style>
     <div id="leftContent">