[fenix] Move creation of GeckoRuntime to flavor-specific source set.

Since we are now able to build against GeckoView Nightly and GeckoView Beta,
we should create the GeckoRuntime from a flavor-specific source set.

Creating the runtime is not covered by the AC abstraction and so API changes
in GeckoView Nightly can break the build and leaves us with no option to fix
it from a shared code base. Separating the creation of GeckoRuntime
allows us to adapt individually and also to configure the runtimes
differently.

app/src/geckoBeta/java/org/mozilla/fenix/engine/GeckoProvider.kt

@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import android.content.Context
+import android.os.Bundle
+import mozilla.components.lib.crash.handler.CrashHandlerService
+import org.mozilla.fenix.utils.Settings
+import org.mozilla.geckoview.GeckoRuntime
+import org.mozilla.geckoview.GeckoRuntimeSettings
+
+object GeckoProvider {
+    var testConfig: Bundle? = null
+    private var runtime: GeckoRuntime? = null
+
+    @Synchronized
+    fun getOrCreateRuntime(context: Context): GeckoRuntime {
+        if (runtime == null) {
+            runtime = createRuntime(context)
+        }
+
+        return runtime!!
+    }
+
+    private fun createRuntime(context: Context): GeckoRuntime {
+        val builder = GeckoRuntimeSettings.Builder()
+
+        testConfig?.let {
+            builder.extras(it)
+                .remoteDebuggingEnabled(true)
+        }
+
+        val runtimeSettings = builder
+            .crashHandler(CrashHandlerService::class.java)
+            .useContentProcessHint(true)
+            .build()
+
+        if (!Settings.getInstance(context).shouldUseAutoSize) {
+            runtimeSettings.automaticFontSizeAdjustment = false
+            val fontSize = Settings.getInstance(context).fontSizeFactor
+            runtimeSettings.fontSizeFactor = fontSize
+        }
+
+        return GeckoRuntime.create(context, runtimeSettings)
+    }
+}

app/src/geckoNightly/java/org/mozilla/fenix/engine/GeckoProvider.kt

@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import android.content.Context
+import android.os.Bundle
+import mozilla.components.lib.crash.handler.CrashHandlerService
+import org.mozilla.fenix.utils.Settings
+import org.mozilla.geckoview.GeckoRuntime
+import org.mozilla.geckoview.GeckoRuntimeSettings
+
+object GeckoProvider {
+    var testConfig: Bundle? = null
+    private var runtime: GeckoRuntime? = null
+
+    @Synchronized
+    fun getOrCreateRuntime(context: Context): GeckoRuntime {
+        if (runtime == null) {
+            runtime = createRuntime(context)
+        }
+
+        return runtime!!
+    }
+
+    private fun createRuntime(context: Context): GeckoRuntime {
+        val builder = GeckoRuntimeSettings.Builder()
+
+        testConfig?.let {
+            builder.extras(it)
+                .remoteDebuggingEnabled(true)
+        }
+
+        val runtimeSettings = builder
+            .crashHandler(CrashHandlerService::class.java)
+            .useContentProcessHint(true)
+            .build()
+
+        if (!Settings.getInstance(context).shouldUseAutoSize) {
+            runtimeSettings.automaticFontSizeAdjustment = false
+            val fontSize = Settings.getInstance(context).fontSizeFactor
+            runtimeSettings.fontSizeFactor = fontSize
+        }
+
+        return GeckoRuntime.create(context, runtimeSettings)
+    }
+}

app/src/main/java/org/mozilla/fenix/browser/BrowserPerformanceTestActivity.kt

@@ -4,12 +4,12 @@
 
 package org.mozilla.fenix.browser
 
+import GeckoProvider
 import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
 import mozilla.components.support.utils.SafeIntent
 import org.mozilla.fenix.IntentReceiverActivity
-import org.mozilla.fenix.ext.components
 
 /**
  * This activity is used for performance testing with Raptor/tp6:
@@ -20,7 +20,7 @@ class BrowserPerformanceTestActivity : Activity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        components.core.testConfig = SafeIntent(intent).extras
+        GeckoProvider.testConfig = SafeIntent(intent).extras
 
         val intent = Intent(intent)
 

app/src/main/java/org/mozilla/fenix/components/Core.kt

@@ -4,9 +4,9 @@
 
 package org.mozilla.fenix.components
 
+import GeckoProvider
 import android.content.Context
 import android.content.res.Configuration
-import android.os.Bundle
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
@@ -27,14 +27,11 @@ import mozilla.components.feature.media.MediaFeature
 import mozilla.components.feature.media.RecordingDevicesNotificationFeature
 import mozilla.components.feature.media.state.MediaStateMachine
 import mozilla.components.feature.session.HistoryDelegate
-import mozilla.components.lib.crash.handler.CrashHandlerService
 import org.mozilla.fenix.AppRequestInterceptor
 import org.mozilla.fenix.FeatureFlags
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.test.Mockable
 import org.mozilla.fenix.utils.Settings
-import org.mozilla.geckoview.GeckoRuntime
-import org.mozilla.geckoview.GeckoRuntimeSettings
 import java.util.concurrent.TimeUnit
 
 /**
@@ -43,30 +40,6 @@ import java.util.concurrent.TimeUnit
 @Mockable
 class Core(private val context: Context) {
 
-    protected val runtime by lazy {
-        val builder = GeckoRuntimeSettings.Builder()
-
-        testConfig?.let {
-            builder.extras(it)
-                .remoteDebuggingEnabled(true)
-        }
-
-        val runtimeSettings = builder
-            .crashHandler(CrashHandlerService::class.java)
-            .useContentProcessHint(true)
-            .build()
-
-        if (!Settings.getInstance(context).shouldUseAutoSize) {
-            runtimeSettings.automaticFontSizeAdjustment = false
-            val fontSize = Settings.getInstance(context).fontSizeFactor
-            runtimeSettings.fontSizeFactor = fontSize
-        }
-
-        GeckoRuntime.create(context, runtimeSettings)
-    }
-
-    var testConfig: Bundle? = null
-
     /**
      * The browser engine component initialized based on the build
      * configuration (see build variants).
@@ -83,14 +56,14 @@ class Core(private val context: Context) {
             suspendMediaWhenInactive = !FeatureFlags.mediaIntegration
         )
 
-        GeckoEngine(context, defaultSettings, runtime)
+        GeckoEngine(context, defaultSettings, GeckoProvider.getOrCreateRuntime(context))
     }
 
     /**
      * [Client] implementation to be used for code depending on `concept-fetch``
      */
     val client: Client by lazy {
-        GeckoViewFetchClient(context, runtime)
+        GeckoViewFetchClient(context, GeckoProvider.getOrCreateRuntime(context))
     }
 
     val sessionStorage: SessionStorage by lazy {

app/src/test/java/org/mozilla/fenix/components/TestCore.kt

@@ -9,12 +9,10 @@ import io.mockk.mockk
 import kotlinx.coroutines.ObsoleteCoroutinesApi
 import mozilla.components.browser.engine.gecko.GeckoEngine
 import mozilla.components.browser.session.SessionManager
-import org.mozilla.geckoview.GeckoRuntime
 
 @ObsoleteCoroutinesApi
 class TestCore(private val context: Context) : Core(context) {
 
-    override val runtime = mockk<GeckoRuntime>(relaxed = true)
     override val engine = mockk<GeckoEngine>(relaxed = true)
     override val sessionManager = SessionManager(engine)
 }