Adds ChromecastConfig to manage cast_shell's PrefService.

chromecast/common/cast_paths.cc

Index: chromecast/common/cast_paths.cc
diff --git a/chromecast/common/cast_paths.cc b/chromecast/common/cast_paths.cc
index b3a77166d96bb6ce5acfa3f41fdecf87ad7f9ecf..c6ce0b62bfd740dc3415e2d56c9178655c5ede83 100644
--- a/chromecast/common/cast_paths.cc
+++ b/chromecast/common/cast_paths.cc
@@ -26,6 +26,17 @@ bool PathProvider(int key, base::FilePath* result) {
 #endif
       return true;
     }
+    case FILE_CAST_CONFIG: {
+      base::FilePath data_dir;
+#if defined(OS_ANDROID)
+      CHECK(PathService::Get(base::DIR_ANDROID_APP_DATA, &data_dir);
+      *result = data_dir.Append("cast_shell.conf");
+#else
+      CHECK(PathService::Get(DIR_CAST_HOME, &data_dir));
+      *result = data_dir.Append(".eureka.conf");
+#endif  // defined(OS_ANDROID)
+      return true;
+    }
   }
   return false;
 }