As per the ContextMenuParam structure (context_menu_params.h)

mLinkText may be an empty string if the contents of the link are an image.

So here as we are doing long press on image link the mLinkText is coming as empty string from nativeside.
And in buildContextMenu it sets header title as mLinkText so it sets "about:blank"

This patch checks if link are an image then sets title as source URL. 

BUG=385000

Review URL: https://codereview.chromium.org/339573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@279673 0039d316-1c4b-4281-b951-d872f2087c98

AUTHORS

@@ -177,6 +177,7 @@ Jingwei Liu <kingweiliu@gmail.com>
 Jingyi Wei <wjywbs@gmail.com>
 Jinho Bang <jinho.bang@samsung.com>
 Jinwoo Song <jinwoo7.song@samsung.com>
+Jitendra Kumar Sahoo <jitendra.ks@samsung.com>
 Joe Knoll <joe.knoll@workday.com>
 Joe Thomas <mhx348@motorola.com>
 Joel Stanley <joel@jms.id.au>

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java

@@ -38,7 +38,10 @@ public boolean shouldShowContextMenu(ContextMenuParams params) {
 
     @Override
     public void buildContextMenu(ContextMenu menu, Context context, ContextMenuParams params) {
-        if (!TextUtils.isEmpty(params.getLinkUrl())) menu.setHeaderTitle(params.getLinkUrl());
+        if (params.isImage() && !TextUtils.isEmpty(params.getSrcUrl()))
+            menu.setHeaderTitle(params.getSrcUrl());
+        else if (!TextUtils.isEmpty(params.getLinkUrl()) )
+            menu.setHeaderTitle(params.getLinkUrl());
 
         if (mMenuInflater == null) mMenuInflater = new MenuInflater(context);