Gmail does not display inline attachments nor does it offer "Show
pictures" within the EML viewer

b/13912473

The Eml viewer (and indeed all Secure Conversation Views) now
offers "Show Pictures" to display the inline images.

Those inline attachments are also displayed as tiles at the
bottom of the Secure Conversation View so that interaction with
them is possible.

Change-Id: Ida66820c98c88b222e459aa9d2559383a3b608a0
diff --git a/src/com/android/mail/ui/ConversationViewFragment.java b/src/com/android/mail/ui/ConversationViewFragment.java
index 74805d5..eefed78 100644
--- a/src/com/android/mail/ui/ConversationViewFragment.java
+++ b/src/com/android/mail/ui/ConversationViewFragment.java
@@ -1038,6 +1038,11 @@
         return (domId == null) ? null : mMessageTransforms.get(domId);
     }
 
+    @Override
+    public boolean isSecure() {
+        return false;
+    }
+
     // END message header callbacks
 
     @Override