[Android] Add UMA SB download size in background and foreground.

chrome/browser/safe_browsing/protocol_manager.cc

Index: chrome/browser/safe_browsing/protocol_manager.cc
diff --git a/chrome/browser/safe_browsing/protocol_manager.cc b/chrome/browser/safe_browsing/protocol_manager.cc
index 78d96ca102abcf7cb20ffa97c408eec0a222f946..50553186a76698c2ebbc3bcc4c95010a88164dde 100644
--- a/chrome/browser/safe_browsing/protocol_manager.cc
+++ b/chrome/browser/safe_browsing/protocol_manager.cc
@@ -124,7 +124,8 @@ SafeBrowsingProtocolManager::SafeBrowsingProtocolManager(
       url_prefix_(config.url_prefix),
       backup_update_reason_(BACKUP_UPDATE_REASON_MAX),
       disable_auto_update_(config.disable_auto_update),
-      url_fetcher_id_(0) {
+      url_fetcher_id_(0),
+      app_in_foreground_(true) {
   DCHECK(!url_prefix_.empty());
 
   backup_url_prefixes_[BACKUP_UPDATE_REASON_CONNECT] =
@@ -706,6 +707,12 @@ void SafeBrowsingProtocolManager::UpdateFinished(bool success) {
 
 void SafeBrowsingProtocolManager::UpdateFinished(bool success, bool back_off) {
   DCHECK(CalledOnValidThread());
+#if defined(OS_ANDROID)
+  if (app_in_foreground_)
+    UMA_HISTOGRAM_COUNTS("SB2.UpdateSizeForeground", update_size_);
+  else
+    UMA_HISTOGRAM_COUNTS("SB2.UpdateSizeBackground", update_size_);
+#endif
   UMA_HISTOGRAM_COUNTS("SB2.UpdateSize", update_size_);
   update_size_ = 0;
   bool update_success = success || request_type_ == CHUNK_REQUEST;