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

chrome/browser/safe_browsing/protocol_manager.h

Index: chrome/browser/safe_browsing/protocol_manager.h
diff --git a/chrome/browser/safe_browsing/protocol_manager.h b/chrome/browser/safe_browsing/protocol_manager.h
index 5588b697540f551f5616a956d84f03d25c36cf5b..47e984b86654b09f3a70654823eaecda7d4116bb 100644
--- a/chrome/browser/safe_browsing/protocol_manager.h
+++ b/chrome/browser/safe_browsing/protocol_manager.h
@@ -166,6 +166,11 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   // Returns whether another update is currently scheduled.
   bool IsUpdateScheduled() const;
 
+  // Called when app changes status of foreground or background.
+  void SetAppInForeground(bool foreground) {
+    app_in_foreground_ = foreground;
+  }
+
  protected:
   // Constructs a SafeBrowsingProtocolManager for |delegate| that issues
   // network requests using |request_context_getter|.
@@ -388,6 +393,9 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   // ID for URLFetchers for testing.
   int url_fetcher_id_;
 
+  // Whether the app is in foreground or background.
+  bool app_in_foreground_;
+
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingProtocolManager);
 };