Make PEM debugging section fixed width in the SSL interstitial

components/security_interstitials/core/browser/resources/interstitial_v2.js

Index: components/security_interstitials/core/browser/resources/interstitial_v2.js
diff --git a/components/security_interstitials/core/browser/resources/interstitial_v2.js b/components/security_interstitials/core/browser/resources/interstitial_v2.js
index 332f6939fc340ff453158478974ec0693860c391..284687e510c01cce167ede5e23445d60a3573d49 100644
--- a/components/security_interstitials/core/browser/resources/interstitial_v2.js
+++ b/components/security_interstitials/core/browser/resources/interstitial_v2.js
@@ -68,8 +68,9 @@ function handleKeypress(e) {
  * (error-debugging-info) visible.
  * @param {string} title  The name of this debugging field.
  * @param {string} value  The value of the debugging field.
+ * @param {string=} extraCssClass Additional CSS classes. Optional.

[lgarron, 2016/10/14 21:33:05]

Nit: I just noticed that this is an incorrect plural. Could you change to
"Additional CSS class" (unless you want to turn this parameter into a list)?

[meacer, 2016/10/14 21:44:37]

Changed the param to a boolean and renamed it.

  */
-function appendDebuggingField(title, value) {
+function appendDebuggingField(title, value, extraCssClass) {

[felt, 2016/10/14 21:32:33]

Do you plan to use this for other things in the future? If not, would it be
easier to read this in the future if it just directly said |fixedWidth| and had
a bool?

[meacer, 2016/10/14 21:44:37]

Not sure if we'll need new stuff, but to keep it simple let's make it
fixedWidth.

   // The values input here are not trusted. Never use innerHTML on these
   // values!
   var spanTitle = document.createElement('span');
@@ -78,6 +79,9 @@ function appendDebuggingField(title, value) {
 
   var spanValue = document.createElement('span');
   spanValue.classList.add('debugging-value');
+  if (extraCssClass) {
+    spanValue.classList.add(extraCssClass);
+  }
   spanValue.innerText = value;
 
   var pElem = document.createElement('p');