Fix imports in gcc_toolchain.gni to not rely on //tools.

build/config/android/config.gni

Index: build/config/android/config.gni
diff --git a/build/config/android/config.gni b/build/config/android/config.gni
index 75ab921e2720c5f4b54d3bb590da4dc6efb61754..6c83db51b682125af77b1de5ea8c920cccd90766 100644
--- a/build/config/android/config.gni
+++ b/build/config/android/config.gni
@@ -132,6 +132,10 @@ if (is_android) {
     # Adds intrumentation to each function. Writes a file with the order that
     # functions are called at startup.
     use_order_profiling = false
+
+    # Enables used resource whitelist generation. Set for official builds only
+    # as a large amount of build output is generated.
+    enable_resource_whitelist_generation = is_android && is_official_build
   }
 
   # We need a second declare_args block to make sure we are using the overridden