Add flag for AIA fetching and enable on waterfall

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 45214b7590c26a8f55f1d72b80d75be8c7a40444..5c8dfd5691f6055a5cc7b7efd33c949f74e80081 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -15621,6 +15621,15 @@ read aloud to screenreader users to announce that a completion is available.">
         Enable postscript generation in place of emf generation when printing to postscript capable printers.
       </message>
     </if>
+
+    <if expr="is_android">
+      <message name="IDS_FLAGS_AIA_FETCHING_NAME" desc="Name of the flag that enables intermediate certificate fetching.">
+        Intermediate Certificate Fetching
+      </message>
+      <message name="IDS_FLAGS_AIA_FETCHING_DESCRIPTION" desc="Description of the flag that enables intermediate certificate fetching.">
+        Enable intermediate certificate fetching when a server does not provide sufficient certificates to build a chain to a trusted root.
+      </message>
+    </if>
   </messages>
  </release>
 </grit>