Create the base Custom Context Menu Dialog.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java
index 963e43dc5010b66726f2f9d439f9b8979f610b67..58ae91dc2b7201840ecdd89b6f6820b0564e36c3 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ContextMenuParams.java
@@ -6,6 +6,7 @@ package org.chromium.chrome.browser.contextmenu;
 
 import android.text.TextUtils;
 
+import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.chrome.browser.UrlConstants;
@@ -133,7 +134,8 @@ public class ContextMenuParams {
         return false;
     }
 
-    private ContextMenuParams(int mediaType, String pageUrl, String linkUrl, String linkText,
+    @VisibleForTesting
+    ContextMenuParams(int mediaType, String pageUrl, String linkUrl, String linkText,
             String unfilteredLinkUrl, String srcUrl, String titleText, boolean imageWasFetchedLoFi,
             Referrer referrer, boolean canSavemedia) {
         mPageUrl = pageUrl;