Add LogConfig.DoodleLogging so doodle logs can be enabled via adb.

To use: adb shell setprop log.tag.DoodleLogging VERBOSE

Bug: 143720134
Change-Id: I61742564c9451ba084e192f823dbf5264702b3a2

src/com/android/launcher3/util/LogConfig.java

@@ -28,4 +28,9 @@ public class LogConfig {
      * When turned on, icon cache is only fetched from memory and not disk.
      */
     public static final String MEMORY_ONLY_ICON_CACHE = "MemoryOnlyIconCache";
+
+    /**
+     * When turned on, we enable doodle related logging.
+     */
+    public static final String DOODLE_LOGGING = "DoodleLogging";
 }