Bug 1756219 - Set test activity to foreground for clipboard test if Android 10+. r=geckoview-reviewers,calu,agi

SelectionActionDelegateTest doesn't wok on Android 10 because Android 10
requires that application must be foreground to write clipboard item.

Also, setting foreground becomes test is slow, so this change is on Android 10+
only.

Differential Revision: https://phabricator.services.mozilla.com/D139237

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/SelectionActionDelegateTest.kt

@@ -15,6 +15,7 @@ import android.content.ClipboardManager
 import android.content.Context
 import android.graphics.RectF;
 import android.os.Build
+import androidx.test.ext.junit.rules.ActivityScenarioRule
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.filters.MediumTest
 import androidx.test.filters.SdkSuppress
@@ -23,7 +24,10 @@ import org.hamcrest.Matcher
 import org.hamcrest.Matchers.*
 import org.json.JSONArray
 import org.junit.Assume.assumeThat
+import org.junit.Before
+import org.junit.Rule
 import org.junit.Test
+import org.junit.rules.RuleChain
 import org.junit.runner.RunWith
 import org.junit.runners.Parameterized
 import org.junit.runners.Parameterized.Parameter
@@ -34,6 +38,11 @@ import org.mozilla.geckoview.GeckoSession
 @RunWith(Parameterized::class)
 @WithDisplay(width = 400, height = 400)
 class SelectionActionDelegateTest : BaseSessionTest() {
+    val activityRule = ActivityScenarioRule(GeckoViewTestActivity::class.java)
+
+    @get:Rule
+    override val rules: RuleChain = RuleChain.outerRule(activityRule).around(sessionRule)
+
     enum class ContentType {
         DIV, EDITABLE_ELEMENT, IFRAME
     }
@@ -72,6 +81,15 @@ class SelectionActionDelegateTest : BaseSessionTest() {
         }
     }
 
+    @Before
+    fun setup() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            // Writing clipboard requires foreground on Android 10.
+            activityRule.scenario.onActivity { activity ->
+                activity.onWindowFocusChanged(true)
+            }
+        }
+    }
 
     /** Generic tests for each content type. */