[Mac] Add testing code to expose an NSColor memory leak.

chrome/browser/cocoa/autocomplete_text_field_cell_unittest.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 <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
 #import "chrome/browser/cocoa/autocomplete_text_field_cell.h"
 #import "chrome/browser/cocoa/cocoa_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 namespace {
 
 class AutocompleteTextFieldCellTest : public PlatformTest {
  public:
   AutocompleteTextFieldCellTest() {
     // Make sure this is wide enough to play games with the cell
     // decorations.
-    NSRect frame = NSMakeRect(0, 0, 300, 30);
+    const NSRect frame = NSMakeRect(0, 0, 300, 30);
     view_.reset([[NSTextField alloc] initWithFrame:frame]);
     scoped_nsobject<AutocompleteTextFieldCell> cell(
         [[AutocompleteTextFieldCell alloc] initTextCell:@"Testing"]);
+    [cell setEditable:YES];
     [view_ setCell:cell.get()];
     [cocoa_helper_.contentView() addSubview:view_.get()];
   }
 
   CocoaTestHelper cocoa_helper_;  // Inits Cocoa, creates window, etc...
   scoped_nsobject<NSTextField> view_;
 };
 
 // Test adding/removing from the view hierarchy, mostly to ensure nothing
 // leaks or crashes.
 TEST_F(AutocompleteTextFieldCellTest, AddRemove) {
   EXPECT_EQ(cocoa_helper_.contentView(), [view_ superview]);
   [view_.get() removeFromSuperview];
   EXPECT_FALSE([view_ superview]);
 }
 
 // Test drawing, mostly to ensure nothing leaks or crashes.
 TEST_F(AutocompleteTextFieldCellTest, Display) {
   [view_ display];
 
+  // Test focussed drawing.
+  cocoa_helper_.makeFirstResponder(view_);
+  [view_ display];
+  cocoa_helper_.clearFirstResponder();
+
   // Test display of various cell configurations.
   AutocompleteTextFieldCell* cell =
       static_cast<AutocompleteTextFieldCell*>([view_ cell]);
 
   [cell setSearchHintString:@"Type to search"];
   [view_ display];
 
   NSImage* image = [NSImage imageNamed:@"NSApplicationIcon"];
   [cell setKeywordHintPrefix:@"prefix" image:image suffix:@"suffix"];
   [view_ display];
@@ skipping 197 matching lines @@
   [cell clearKeywordAndHint];
   textFrame = [cell textFrameForFrame:bounds];
   EXPECT_FALSE(NSIsEmptyRect(textFrame));
   EXPECT_TRUE(NSContainsRect(bounds, textFrame));
   EXPECT_EQ(NSMinX(bounds), NSMinX(textFrame));
   EXPECT_EQ(NSMaxX(bounds), NSMaxX(textFrame));
   EXPECT_TRUE(NSContainsRect(cursorFrame, textFrame));
 }
 
 }  // namespace