Add a user pref in Settings to disable all GPU features.

chrome/browser/resources/options/browser_options.html

Index: chrome/browser/resources/options/browser_options.html
===================================================================
--- chrome/browser/resources/options/browser_options.html	(revision 186737)
+++ chrome/browser/resources/options/browser_options.html	(working copy)
@@ -689,9 +689,9 @@
   </section>
 </if>
 </if>
+  <section id="system-section">
+    <h3 i18n-content="advancedSectionTitleSystem"></h3>
 <if expr="not is_macosx and not pp_ifdef('chromeos')">
-  <section id="background-section">
-    <h3 i18n-content="advancedSectionTitleBackground"></h3>
     <div class="checkbox">
       <span class="controlled-setting-with-label">
         <input id="backgroundModeCheckbox" pref="background_mode.enabled"
@@ -706,8 +706,22 @@
         </span>
       </span>
     </div>
+</if>
+    <div class="checkbox">
+      <span class="controlled-setting-with-label">
+        <input id="hardwareAccelerationModeCheckbox"
+            pref="hardware_acceleration_mode.enabled" type="checkbox">
+        <span>
+          <label for="hardwareAccelerationCheckbox"
+              i18n-content="hardwareAccelerationModeCheckbox">
+          </label>
+          <span class="controlled-setting-indicator"
+              pref="hardware_acceleration_mode.enabled">
+          </span>
+        </span>
+      </span>
+    </div>
   </section>
-</if>
 <section id="managed-user-settings-section" hidden>
   <h3 i18n-content="managedUsersSectionTitle"></h3>
   <button id="open-managed-user-settings-button"