Mojo Bindings: Put typemap files in the build dependency tree

mojo/public/tools/bindings/chromium_bindings_configuration.gni

Index: mojo/public/tools/bindings/chromium_bindings_configuration.gni
diff --git a/mojo/public/tools/bindings/chromium_bindings_configuration.gni b/mojo/public/tools/bindings/chromium_bindings_configuration.gni
index 55f38fd02a1206126859294efeff6aa2c4b02bba..b075df8648d5f3924256f0f852aa344cd34b376e 100644
--- a/mojo/public/tools/bindings/chromium_bindings_configuration.gni
+++ b/mojo/public/tools/bindings/chromium_bindings_configuration.gni
@@ -56,7 +56,10 @@ foreach(typemap_import, _typemap_imports) {
 
 typemaps = []
 foreach(typemap, _typemaps) {
-  typemaps += [ read_file(typemap, "scope") ]
+  typemaps += [ {
+        filename = typemap
+        config = read_file(typemap, "scope")
+      } ]
 }
 
 _typemaps_mac = []
@@ -69,5 +72,8 @@ foreach(typemap_import, _typemap_imports_mac) {
 
 typemaps_mac = []
 foreach(typemap, _typemaps_mac) {
-  typemaps_mac += [ read_file(typemap, "scope") ]
+  typemaps_mac += [ {
+        filename = typemap
+        config = read_file(typemap, "scope")
+      } ]
 }