Keep focus on Find-In-Page buttons when using the keyboard to navigate.

chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm

Index: chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
diff --git a/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm b/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
index 336fbdfd7052100d7bc9edda76a8b61a2ca0f5ea..5c7d884d2fcbc26c896eace1fe75f1f514fc5159 100644
--- a/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
+++ b/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
@@ -87,6 +87,12 @@ const float kRightEdgeOffset = 25;
                name:kFindPasteboardChangedNotification
              object:[FindPasteboard sharedInstance]];
     browser_ = browser;
+
+    // Set ViewIDs for the buttons which don't have their dedicated class.
+    // ViewID of |findText_| is handled by itself.
+    view_id_util::SetID(previousButton_, VIEW_ID_FIND_IN_PAGE_PREVIOUS_BUTTON);
+    view_id_util::SetID(nextButton_, VIEW_ID_FIND_IN_PAGE_NEXT_BUTTON);
+    view_id_util::SetID(closeButton_, VIEW_ID_FIND_IN_PAGE_CLOSE_BUTTON);
   }
   return self;
 }
@@ -102,6 +108,12 @@ const float kRightEdgeOffset = 25;
   DCHECK(!moveAnimation_.get());
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   browser_ = nullptr;
+
+  // Set ViewIDs for the buttons which don't have their dedicated class.

[tapted, 2016/02/09 02:41:24]

This comment isn't right. I think it can just be omitted, since this is located
pretty near to the initializer.

+  // ViewID of |findText_| is handled by itself.
+  view_id_util::UnsetID(previousButton_);
+  view_id_util::UnsetID(nextButton_);
+  view_id_util::UnsetID(closeButton_);
 }
 
 - (void)setFindBarBridge:(FindBarBridge*)findBarBridge {