Add the field trial config for ForwardMemoryPressureEventsToGpuProcess

Bug: 1028410
Change-Id: I99d415261b48e05d401148dcf6b1165c0f020f16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042311
Auto-Submit: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739103}

testing/variations/fieldtrial_testing_config.json

@@ -2641,6 +2641,24 @@
             ]
         }
     ],
+    "ForwardMemoryPressureEventsToGpuProcess": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "ForwardMemoryPressureEventsToGpuProcess"
+                    ]
+                }
+            ]
+        }
+    ],
     "FreezeBackgroundTabOnNetworkIdle": [
         {
             "platforms": [