Finch code for OfflinePagesSharing

Ensures that test bots cover OfflinePagesSharing flag scenarios.

Bug: 758733
Change-Id: Id73eebc0e9592318ed4d33b95dc169574bc0efc3
Reviewed-on: https://chromium-review.googlesource.com/1043349Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Jian Li <jianli@chromium.org>
Commit-Queue: Peter Williamson <petewil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557636}

chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadActivityTest.java

@@ -47,6 +47,7 @@ import org.chromium.chrome.browser.widget.ListMenuButton.Item;
 import org.chromium.chrome.browser.widget.selection.SelectionDelegate.SelectionObserver;
 import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
 import org.chromium.chrome.test.util.browser.Features;
+import org.chromium.chrome.test.util.browser.Features.DisableFeatures;
 import org.chromium.chrome.test.util.browser.Features.EnableFeatures;
 import org.chromium.components.offline_items_collection.OfflineItem;
 import org.chromium.content.browser.test.util.Criteria;
@@ -512,6 +513,7 @@ public class DownloadActivityTest {
 
     @Test
     @MediumTest
+    @DisableFeatures("OfflinePagesSharing")
     public void testShareFiles() throws Exception {
         // Adapter positions:
         // 0 = space display

testing/variations/fieldtrial_testing_config.json

@@ -2249,6 +2249,21 @@
             ]
         }
     ],
+    "OfflinePagesSharing": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "OfflinePagesSharing"
+                    ]
+                }
+            ]
+        }
+    ],
     "OmniboxBundledExperimentV1": [
         {
             "platforms": [