MD Settings: Allow copying text to clipboard from the About page.

chrome/browser/resources/settings/about_page/about_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/about_page/about_page_browser_proxy.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/lifetime_browser_proxy.html">
 <link rel="import" href="/settings_page/main_page_behavior.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_section.html">
 <link rel="import" href="/settings_page_css.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 
 <if expr="chromeos">
 <link rel="import" href="/about_page/detailed_build_info.html">
 <link rel="import" href="/settings_page/settings_subpage.html">
 </if>
 
 <dom-module id="settings-about-page">
   <template>
     <style include="settings-shared settings-page-styles">
+      div.copyable {

[Dan Beam, 2016/07/13 01:49:00]

nit: div doesn't help in this selector

[dpapad, 2016/07/13 17:40:28]

Done.

+        -webkit-user-select: text;
+      }
+
       .product-title {
         font-size: 20px;
         margin-bottom: auto;
         margin-top: auto;
       }
 
       img {
         -webkit-margin-end: 10px;
       }
 
@@ skipping 54 matching lines @@
                       currentUpdateStatusEvent_, targetChannel_)]]
 </if>
                 </div>
                 <span id="deprecationWarning"
                     hidden="[[!obsoleteSystemInfo_.obsolete]]">
                   $i18n{aboutObsoleteSystem}
                   <a href="$i18n{aboutObsoleteSystemURL}" target="_blank">
                     $i18n{learnMore}
                   </a>
                 </span>
-                <div class="secondary">$i18n{aboutBrowserVersion}</div>
+                <div class="secondary copyable">$i18n{aboutBrowserVersion}</div>
               </div>
               <span class="secondary-action">
                 <paper-button id="relaunch" class="secondary-button"
 <if expr="not chromeos">
                     hidden="[[!shouldShowRelaunch_(currentUpdateStatusEvent_)]]"
 </if>
 <if expr="chromeos">
                     hidden="[[!shouldShowRelaunch_(
                         currentUpdateStatusEvent_, targetChannel_)]]"
 </if>
@@ skipping 25 matching lines @@
               $i18n{aboutReportAnIssue}
             </div>
 </if>
 <if expr="chromeos">
             <div class="settings-box" on-tap="onDetailedBuildInfoTap_"
                 actionable>
               <!-- TODO(dpapad): Localize string. -->
               Detailed build info
             </div>
 </if>
-            <div class="settings-box product-info">
+            <div class="settings-box product-info copyable">
               <div class="info-section">
                 <div class="secondary">$i18n{aboutProductTitle}</div>
                 <div class="secondary">$i18n{aboutProductCopyright}</div>
               </div>
 
               <div class="info-section">
                 <div class="secondary">$i18nRaw{aboutProductLicense}</div>
 <if expr="chromeos">
                 <div class="secondary">$i18nRaw{aboutProductOsLicense}</div>
 </if>
@@ skipping 15 matching lines @@
               <settings-detailed-build-info></settings-detailed-build-info>
             </settings-subpage>
           </template>
 </if>
         </settings-animated-pages>
       </settings-section>
     </div>
   </template>
   <script src="about_page.js"></script>
 </dom-module>