First commit of dynamic home page feature

- Add SettingsHomepageActivity
- Add feature flag
- Use com.google.android.material_material library

Change-Id: I325be249f739d3b03dc2f0d722319f5771e2313b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 3b6d4f8..19c8e5e 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -123,12 +123,19 @@
                 android:value="true" />
         </activity>
 
+        <activity android:name=".SettingsHomepageActivity"
+                  android:taskAffinity="com.android.settings.root"
+                  android:label="@string/settings_label_launcher"
+                  android:theme="@style/Theme.Settings.Home"
+                  android:launchMode="singleTask">
+        </activity>
+
         <!-- Alias for launcher activity only, as this belongs to each profile. -->
         <activity-alias android:name="Settings"
                 android:taskAffinity="com.android.settings.root"
                 android:label="@string/settings_label_launcher"
                 android:launchMode="singleTask"
-                android:targetActivity="Settings">
+                android:targetActivity=".SettingsHomepageActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.DEFAULT" />