[Memory Sheriff] Force a well-defined path for system leak.

ui/gfx/test/ui_cocoa_test_helper.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/gfx/test/ui_cocoa_test_helper.h"
 
 #include "base/debug/debugger.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/test/test_timeouts.h"
 
+namespace {
+
+// Some AppKit function leak intentionally, e.g. for caching purposes.

[Nico, 2014/06/04 22:08:15]

Does anything actually report these leaks? I would've thought that since they're
reachable from statics, they shouldn't be reported? (Well, at least the cursor
one)

+// Force those leaks here, so there can be a unique calling path, allowing
+// to flag intentional leaks without having to suppress all calls to
+// potentially leaky functions.
+void NOINLINE ForceSystemLeaks() {
+  // First NSCursor push always leaks.
+  [[NSCursor openHandCursor] push];
+  [NSCursor pop];
+}
+
+}  // namespace.
+
 @implementation CocoaTestHelperWindow
 
 - (id)initWithContentRect:(NSRect)contentRect {
   return [self initWithContentRect:contentRect
                          styleMask:NSBorderlessWindowMask
                            backing:NSBackingStoreBuffered
                              defer:NO];
 }
 
 - (id)init {
@@ skipping 22 matching lines @@
 
 - (BOOL)isKeyWindow {
   return pretendIsKeyWindow_;
 }
 
 @end
 
 namespace ui {
 
 CocoaTest::CocoaTest() : called_tear_down_(false), test_window_(nil) {
+  ForceSystemLeaks();
   Init();
 }
 
 CocoaTest::~CocoaTest() {
   // Must call CocoaTest's teardown from your overrides.
   DCHECK(called_tear_down_);
 }
 
 void CocoaTest::Init() {
   // Set the duration of AppKit-evaluated animations (such as frame changes)
@@ skipping 127 matching lines @@
     if (base::debug::BeingDebugged()) {
       [test_window_ orderFront:nil];
     } else {
       [test_window_ orderBack:nil];
     }
   }
   return test_window_;
 }
 
 }  // namespace ui