[IndexedDB] Adding uma for transaction aborts

content/browser/indexed_db/indexed_db_transaction.cc

Index: content/browser/indexed_db/indexed_db_transaction.cc
diff --git a/content/browser/indexed_db/indexed_db_transaction.cc b/content/browser/indexed_db/indexed_db_transaction.cc
index 904a284651a5220be85d53d13c6958292ac8756c..5fe8767263d41b14e068827d163a39eb32e1d5d1 100644
--- a/content/browser/indexed_db/indexed_db_transaction.cc
+++ b/content/browser/indexed_db/indexed_db_transaction.cc
@@ -8,6 +8,7 @@
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ -36,6 +37,41 @@ void CommitUnused(base::WeakPtr<IndexedDBTransaction> transaction) {
   DCHECK(status.ok());
 }
 
+// Used for UMA metrics - do not change values.
+enum UmaIDBException {
+  UmaIDBExceptionUnknownError = 0,
+  UmaIDBExceptionConstraintError = 1,
+  UmaIDBExceptionDataError = 2,
+  UmaIDBExceptionVersionError = 3,
+  UmaIDBExceptionAbortError = 4,
+  UmaIDBExceptionQuotaError = 5,
+  UmaIDBExceptionTimeoutError = 6,
+  UmaIDBExceptionExclusiveMaxValue = 7
+};
+
+// Used for UMA metrics - do not change mappings.
+UmaIDBException ExceptionCodeToUmaEnum(uint16_t code) {
+  switch (code) {
+    case blink::kWebIDBDatabaseExceptionUnknownError:
+      return UmaIDBExceptionUnknownError;
+    case blink::kWebIDBDatabaseExceptionConstraintError:
+      return UmaIDBExceptionConstraintError;
+    case blink::kWebIDBDatabaseExceptionDataError:
+      return UmaIDBExceptionDataError;
+    case blink::kWebIDBDatabaseExceptionVersionError:
+      return UmaIDBExceptionVersionError;
+    case blink::kWebIDBDatabaseExceptionAbortError:
+      return UmaIDBExceptionAbortError;
+    case blink::kWebIDBDatabaseExceptionQuotaError:
+      return UmaIDBExceptionQuotaError;
+    case blink::kWebIDBDatabaseExceptionTimeoutError:
+      return UmaIDBExceptionTimeoutError;
+    default:
+      NOTREACHED();
+  }
+  return UmaIDBExceptionUnknownError;
+}
+
 }  // namespace
 
 IndexedDBTransaction::TaskQueue::TaskQueue() {}
@@ -152,6 +188,10 @@ void IndexedDBTransaction::Abort(const IndexedDBDatabaseError& error) {
   if (state_ == FINISHED)
     return;
 
+  UMA_HISTOGRAM_ENUMERATION("WebCore.IndexedDB.TransactionAbortReason",
+                            ExceptionCodeToUmaEnum(error.code()),
+                            UmaIDBExceptionExclusiveMaxValue);
+
   timeout_timer_.Stop();
 
   state_ = FINISHED;