Make all quota-exceeding messages in the storage API explain what the failure

chrome/browser/bookmarks/bookmark_extension_api.cc

Index: chrome/browser/bookmarks/bookmark_extension_api.cc
diff --git a/chrome/browser/bookmarks/bookmark_extension_api.cc b/chrome/browser/bookmarks/bookmark_extension_api.cc
index e9f7cc4adf79320510a913e86ef290092fa37bef..7860f4dcd0b9ad0b6b796d6103d16ebdeb4fbf47 100644
--- a/chrome/browser/bookmarks/bookmark_extension_api.cc
+++ b/chrome/browser/bookmarks/bookmark_extension_api.cc
@@ -814,10 +814,16 @@ class BookmarksQuotaLimitFactory {
       TimeDelta::FromHours(1)    // 1 hour long refill interval.
     };
 
-    TimedLimit* timed = new TimedLimit(kLongLimitConfig, long_mapper);
+    TimedLimit* timed = new TimedLimit(
+        kLongLimitConfig,
+        long_mapper,
+        "operations per minute");
     // A max of two operations per minute, sustained over 10 minutes.
-    SustainedLimit* sustained = new SustainedLimit(TimeDelta::FromMinutes(10),
-        kShortLimitConfig, short_mapper);
+    SustainedLimit* sustained = new SustainedLimit(
+        TimeDelta::FromMinutes(10),
+        kShortLimitConfig,
+        short_mapper,
+        "sustained operations per 10 minutes");
     heuristics->push_back(timed);
     heuristics->push_back(sustained);
   }