Add source column to chrome://policy showing the origins of policies.

tools/gritsettings/resource_ids

Index: tools/gritsettings/resource_ids
diff --git a/tools/gritsettings/resource_ids b/tools/gritsettings/resource_ids
index 5794db7529f31434c368b14b77036fd8b7c0f588..224e840c1db7736589a183ed79489d09b01e10f5 100644
--- a/tools/gritsettings/resource_ids
+++ b/tools/gritsettings/resource_ids
@@ -259,26 +259,26 @@
   # We only use one file depending on whether we're building Chromium or
   # Google Chrome.
   "components/components_chromium_strings.grd": {
-    "messages": [30140],
+    "messages": [30160],
   },
   "components/components_google_chrome_strings.grd": {
-    "messages": [30140],
+    "messages": [30160],
   },
   "components/resources/components_resources.grd": {
-    "includes": [30155],
+    "includes": [30175],
   },
   "components/resources/components_scaled_resources.grd": {
-    "structures": [30310],
+    "structures": [30350],
   },
   "third_party/WebKit/public/blink_resources.grd": {
-    "includes": [30350],
-    "structures": [30650],
+    "includes": [30370],
+    "structures": [30670],
   },
   "chrome/browser/devtools/device/webrtc/resources.grd": {
-    "includes": [30800],
+    "includes": [30820],
   },
   "chrome/browser/resources/settings/settings_resources.grd": {
-    "structures": [30900],
+    "structures": [30920],
   },
 
   # Resource ids starting at 31000 are reserved for projects built on Chromium.