Push API: Don't require notification if tab is visible.

chrome/browser/ui/android/tab_model/tab_model.cc

Index: chrome/browser/ui/android/tab_model/tab_model.cc
diff --git a/chrome/browser/ui/android/tab_model/tab_model.cc b/chrome/browser/ui/android/tab_model/tab_model.cc
index 2d5bd6a04f043705bbcf52b55161a7cb80fd45f0..1c07f779d9e4f3789fdb96c896be893b6551c241 100644
--- a/chrome/browser/ui/android/tab_model/tab_model.cc
+++ b/chrome/browser/ui/android/tab_model/tab_model.cc
@@ -14,6 +14,10 @@
 
 using content::NotificationService;
 
+// Keep this in sync with
+// chrome/android/java/src/org/chromium/chrome/browser/tabmodel/TabList.java
+static int INVALID_TAB_INDEX = -1;
+
 TabModel::TabModel(Profile* profile)
   : profile_(profile),
     synced_window_delegate_(
@@ -58,6 +62,13 @@ SessionID::id_type TabModel::GetSessionId() const {
   return session_id_.id();
 }
 
+content::WebContents* TabModel::GetActiveWebContents() const {
+  int active_index = GetActiveIndex();
+  if (active_index == INVALID_TAB_INDEX)
+    return nullptr;
+  return GetWebContentsAt(active_index);
+}
+
 void TabModel::BroadcastSessionRestoreComplete() {
   if (profile_) {
     NotificationService::current()->Notify(