Update chooser row view when mouse click down and move over rows

This CL adds code to update row view in the chooser when mouse button
is down and moves over rows.

BUG=645693

Review-Url: https://codereview.chromium.org/2382373002
Cr-Commit-Position: refs/heads/master@{#422850}

chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm

@@ -66,6 +66,12 @@ initWithChooserDialogCocoa:(ChooserDialogCocoa*)chooserDialogCocoa
   [connectButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
 }
 
+// Selection changes (while the mouse button is still down).
+- (void)tableViewSelectionIsChanging:(NSNotification*)aNotification {
+  [chooserContentView_ updateContentRowColor];
+  [connectButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
+}
+
 - (void)onConnect:(id)sender {
   [chooserContentView_ accept];
   chooserDialogCocoa_->Dismissed();

chrome/browser/ui/cocoa/website_settings/chooser_bubble_ui_cocoa.mm

@@ -213,6 +213,12 @@ std::unique_ptr<BubbleUi> ChooserBubbleDelegate::BuildBubbleUi() {
   [connectButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
 }
 
+// Selection changes (while the mouse button is still down).
+- (void)tableViewSelectionIsChanging:(NSNotification*)aNotification {
+  [chooserContentView_ updateContentRowColor];
+  [connectButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
+}
+
 - (void)updateAnchorPosition {
   [self setParentWindow:[self getExpectedParentWindow]];
   [self setAnchorPoint:[self getExpectedAnchorPoint]];