Menu hook plumbed through to RequestCoordinator.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
index ae87636e6c5f53d66916851d22d1c6f36ef27efd..95e4732dc6298988ed9756f3c3365f00cd700bac 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/ChromeContextMenuPopulator.java
@@ -351,8 +351,9 @@ public class ChromeContextMenuPopulator implements ContextMenuPopulator {
                 helper.startContextMenuDownload(true, false);
             }
         } else if (itemId == R.id.contextmenu_save_offline) {

[dougarnett, 2016/05/06 16:47:41]

btw, I wonder if we should use the save_page_later terminology for the menu
option instead of save_offline in order to tie it more directly to the api
terminology

[Pete Williamson, 2016/05/06 18:28:13]

Left as is for now.  Remember that this is not speced UI, but just a test hook
for us, and I think for us, having it say "offline the linked page" is better. 
If PM/UX decides they like this feature, we will ask UX for the best string to
use here.

-            // TODO(petewil): Add code here to save the page offline.
-            Log.d(TAG, "Save an offline copy of the linked page");
+            // TODO(petewil): This is for testing only, remove it once we add
+            // a way to save for later from the Dino page.
+            helper.savePageLater(params.getLinkUrl(), mDelegate.getOfflinePageBridge());
         } else if (itemId == R.id.contextmenu_search_by_image) {
             ContextMenuUma.record(params, ContextMenuUma.ACTION_SEARCH_BY_IMAGE);
             helper.searchForImage();