Bug 730941 - Add "view image" to context menu. r=wesj

mobile/android/chrome/content/browser.js

@@ -652,6 +652,15 @@ var BrowserApp = {
         aTarget.muted = false;
       });
 
+    NativeWindow.contextmenus.add(Strings.browser.GetStringFromName("contextmenu.viewImage"),
+      NativeWindow.contextmenus.imageLocationCopyableContext,
+      function(aTarget) {
+        let url = aTarget.src;
+        ContentAreaUtils.urlSecurityCheck(url, aTarget.ownerDocument.nodePrincipal,
+                                          Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+        BrowserApp.loadURI(url);
+      });
+
     NativeWindow.contextmenus.add(Strings.browser.GetStringFromName("contextmenu.copyImageLocation"),
       NativeWindow.contextmenus.imageLocationCopyableContext,
       function(aTarget) {

mobile/android/locales/en-US/chrome/browser.properties

@@ -174,6 +174,7 @@ contextmenu.copyPhoneNumber=Copy Phone Number
 contextmenu.sharePhoneNumber=Share Phone Number
 contextmenu.changeInputMethod=Select Input Method
 contextmenu.fullScreen=Full Screen
+contextmenu.viewImage=View Image
 contextmenu.copyImageLocation=Copy Image Location
 contextmenu.shareImage=Share Image
 # LOCALIZATION NOTE (contextmenu.search):