Enable ClickPointerEvent flag for tests

Bug: 989958
Change-Id: I6b22f34ad6b1da138bbd90a905508d9dd789cd96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2268384Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784281}

testing/variations/fieldtrial_testing_config.json

@@ -1582,6 +1582,25 @@
             ]
         }
     ],
+    "ClickPointerEvent": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "ClickPointerEvent"
+                    ]
+                }
+            ]
+        }
+    ],
     "ClientSideDetectionModel": [
         {
             "platforms": [