MacViews: Implement SetCursor

ui/views/cocoa/bridged_content_view.mm

 // Copyright 2014 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 "ui/views/cocoa/bridged_content_view.h"
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/base/ime/text_input_client.h"
@@ skipping 64 matching lines @@
 - (id)initWithView:(views::View*)viewToHost {
   DCHECK(viewToHost);
   gfx::Rect bounds = viewToHost->bounds();
   // To keep things simple, assume the origin is (0, 0) until there exists a use
   // case for something other than that.
   DCHECK(bounds.origin().IsOrigin());
   NSRect initialFrame = NSMakeRect(0, 0, bounds.width(), bounds.height());
   if ((self = [super initWithFrame:initialFrame])) {
     hostedView_ = viewToHost;
 
-    trackingArea_.reset(
-        [[CrTrackingArea alloc] initWithRect:NSZeroRect
-                                     options:NSTrackingMouseMoved |
-                                             NSTrackingActiveAlways |
-                                             NSTrackingInVisibleRect
-                                       owner:self
-                                    userInfo:nil]);
+    // Apple's documentation says that NSTrackingActiveAlways is incompatible
+    // with NSTrackingCursorUpdate, so use NSTrackingActiveInActiveApp.
+    trackingArea_.reset([[CrTrackingArea alloc]
+        initWithRect:NSZeroRect
+             options:NSTrackingMouseMoved | NSTrackingCursorUpdate |
+                     NSTrackingActiveInActiveApp | NSTrackingInVisibleRect
+               owner:self
+            userInfo:nil]);
     [self addTrackingArea:trackingArea_.get()];
   }
   return self;
 }
 
 - (void)clearView {
   hostedView_ = NULL;
   [trackingArea_.get() clearOwner];
   [self removeTrackingArea:trackingArea_.get()];
 }
@@ skipping 470 matching lines @@
   }
 
   return [super accessibilityAttributeValue:attribute];
 }
 
 - (id)accessibilityHitTest:(NSPoint)point {
   return [hostedView_->GetNativeViewAccessible() accessibilityHitTest:point];
 }
 
 @end