First few accessibility tweaks.

chrome/browser/cocoa/tab_view.mm

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/cocoa/tab_view.h"
 
 #include "base/logging.h"
 #include "base/nsimage_cache_mac.h"
 #import "chrome/browser/cocoa/tab_controller.h"
 #import "chrome/browser/cocoa/tab_window_controller.h"
@@ skipping 776 matching lines @@
 - (void)cancelAlert {
   if (alertState_ != tabs::kAlertNone) {
     alertState_ = tabs::kAlertFalling;
     alertHoldEndTime_ =
         [NSDate timeIntervalSinceReferenceDate] + kGlowUpdateInterval;
     [self resetLastGlowUpdateTime];
     [self adjustGlowValue];
   }
 }
 
+- (BOOL)accessibilityIsIgnored {
+  return NO;
+}
+
+- (NSArray*)accessibilityActionNames {
+  NSArray* parentActions = [super accessibilityActionNames];
+
+  return [parentActions arrayByAddingObject:NSAccessibilityPressAction];
+}
+
+- (id)accessibilityAttributeValue:(NSString*)attribute {
+  if ([attribute isEqual:NSAccessibilityRoleAttribute])
+    return NSAccessibilityButtonRole;
+
+  return [super accessibilityAttributeValue:attribute];
+}
+
 @end  // @implementation TabView
 
 @implementation TabView(Private)
 
 - (void)resetLastGlowUpdateTime {
   lastGlowUpdate_ = [NSDate timeIntervalSinceReferenceDate];
 }
 
 - (NSTimeInterval)timeElapsedSinceLastGlowUpdate {
   return [NSDate timeIntervalSinceReferenceDate] - lastGlowUpdate_;
@@ skipping 72 matching lines @@
   }
 
   if (nextUpdate < kNoUpdate)
     [self performSelector:_cmd withObject:nil afterDelay:nextUpdate];
 
   [self resetLastGlowUpdateTime];
   [self setNeedsDisplay:YES];
 }
 
 @end  // @implementation TabView(Private)