Add a Physical Web data source

components/physical_web_data_source/BUILD.gn

Index: components/physical_web_data_source/BUILD.gn
diff --git a/ios/public/consumer/base/BUILD.gn b/components/physical_web_data_source/BUILD.gn
similarity index 65%
copy from ios/public/consumer/base/BUILD.gn
copy to components/physical_web_data_source/BUILD.gn
index eb83ba22b1adcf0d9f15821bbf91574e002c623a..c5fbe0747618ea477cc9dd285c0d5dbdb993c307 100644
--- a/ios/public/consumer/base/BUILD.gn
+++ b/components/physical_web_data_source/BUILD.gn
@@ -2,11 +2,12 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("base") {
+source_set("physical_web_data_source") {
   sources = [
-    "//ios/consumer/base/debugger.mm",
-    "//ios/public/consumer/base/debugger.h",
+    "physical_web_data_source.cc",
+    "physical_web_data_source.h",
   ]
+
   deps = [
     "//base",
   ]