Adding a utility class to simplify main process initialization.

Change-Id: I796cf758d2a25cf8fd5f9a9b78a7977fd54ca451
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 3fde58b..f6abae8 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -294,10 +294,6 @@
         }
         TraceHelper.beginSection("Launcher-onCreate");
 
-        if (mLauncherCallbacks != null) {
-            mLauncherCallbacks.preOnCreate();
-        }
-
         WallpaperColorInfo wallpaperColorInfo = WallpaperColorInfo.getInstance(this);
         wallpaperColorInfo.setOnThemeChangeListener(this);
         overrideTheme(wallpaperColorInfo.isDark(), wallpaperColorInfo.supportsDarkText());
diff --git a/src/com/android/launcher3/LauncherCallbacks.java b/src/com/android/launcher3/LauncherCallbacks.java
index ed7bf3d..35faaea 100644
--- a/src/com/android/launcher3/LauncherCallbacks.java
+++ b/src/com/android/launcher3/LauncherCallbacks.java
@@ -37,7 +37,6 @@
      * Activity life-cycle methods. These methods are triggered after
      * the code in the corresponding Launcher method is executed.
      */
-    void preOnCreate();
     void onCreate(Bundle savedInstanceState);
     void onResume();
     void onStart();
diff --git a/src/com/android/launcher3/LauncherProvider.java b/src/com/android/launcher3/LauncherProvider.java
index 98568e4..138ea0f 100644
--- a/src/com/android/launcher3/LauncherProvider.java
+++ b/src/com/android/launcher3/LauncherProvider.java
@@ -54,7 +54,6 @@
 import com.android.launcher3.LauncherSettings.WorkspaceScreens;
 import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.config.FeatureFlags;
-import com.android.launcher3.graphics.IconShapeOverride;
 import com.android.launcher3.logging.FileLog;
 import com.android.launcher3.model.DbDowngradeHelper;
 import com.android.launcher3.provider.LauncherDbUtils;
@@ -116,11 +115,8 @@
         mListenerHandler = new Handler(mListenerWrapper);
 
         // The content provider exists for the entire duration of the launcher main process and
-        // is the first component to get created. Initializing FileLog here ensures that it's
-        // always available in the main process.
-        FileLog.setDir(getContext().getApplicationContext().getFilesDir());
-        IconShapeOverride.apply(getContext());
-        SessionCommitReceiver.applyDefaultUserPrefs(getContext());
+        // is the first component to get created.
+        MainProcessInitializer.initialize(getContext().getApplicationContext());
         return true;
     }
 
diff --git a/src/com/android/launcher3/MainProcessInitializer.java b/src/com/android/launcher3/MainProcessInitializer.java
new file mode 100644
index 0000000..462eadb
--- /dev/null
+++ b/src/com/android/launcher3/MainProcessInitializer.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3;
+
+import android.content.Context;
+
+import com.android.launcher3.graphics.IconShapeOverride;
+import com.android.launcher3.logging.FileLog;
+
+/**
+ * Utility class to handle one time initializations of the main process
+ */
+public class MainProcessInitializer {
+
+    public static void initialize(Context context) {
+        Utilities.getOverrideObject(
+                MainProcessInitializer.class, context, R.string.main_process_initializer_class)
+                .init(context);
+    }
+
+    protected void init(Context context) {
+        FileLog.setDir(context.getApplicationContext().getFilesDir());
+        IconShapeOverride.apply(context);
+        SessionCommitReceiver.applyDefaultUserPrefs(context);
+    }
+}