[ios] Add history entry to ntp::recordAction.

Bug: 821360
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I5665d51929d483f5f94130cffec9dd3fad601608
Reviewed-on: https://chromium-review.googlesource.com/971704Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544727}

ios/chrome/browser/metrics/new_tab_page_uma.h

@@ -29,6 +29,7 @@ enum ActionType {
   ACTION_OPENED_SUGGESTION,
   ACTION_OPENED_LEARN_MORE,
   ACTION_OPENED_PROMO,
+  ACTION_OPENED_HISTORY_ENTRY,
   NUM_ACTION_TYPES,
 };
 

ios/chrome/browser/ui/history/BUILD.gn

@@ -50,6 +50,7 @@ source_set("history") {
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/favicon",
     "//ios/chrome/browser/history",
+    "//ios/chrome/browser/metrics:metrics_internal",
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/sync",
     "//ios/chrome/browser/ui",

ios/chrome/browser/ui/history/history_collection_view_controller.mm

@@ -24,6 +24,7 @@
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/history/history_service_factory.h"
+#import "ios/chrome/browser/metrics/new_tab_page_uma.h"
 #import "ios/chrome/browser/signin/authentication_service.h"
 #include "ios/chrome/browser/signin/authentication_service_factory.h"
 #include "ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory.h"
@@ -880,6 +881,8 @@ const CGFloat kSeparatorInset = 10;
 
 - (void)openURL:(const GURL&)URL {
   GURL copiedURL(URL);
+  new_tab_page_uma::RecordAction(_browserState,
+                                 new_tab_page_uma::ACTION_OPENED_HISTORY_ENTRY);
   [self.delegate historyCollectionViewController:self
                        shouldCloseWithCompletion:^{
                          [self.URLLoader

tools/metrics/histograms/enums.xml

@@ -31780,6 +31780,7 @@ Called by update_net_trust_anchors.py.-->
   <int value="9" label="Opened a suggestion"/>
   <int value="10" label="Opened the Learn More link"/>
   <int value="11" label="Opened the Promo"/>
+  <int value="12" label="Opened a history entry"/>
 </enum>
 
 <enum name="NewTabPageBookmarkActionAndroid">