Mac: Disable loading 2x bitmaps on 10.5 and 10.6

Loading 2x bitmaps on 10.5 caused a regression in our startup time.

Since we don't need 2x bitmaps on 10.5 and 10.6 simple fix is to simply disable loading the bitmaps on those platforms.

BUG=80501
TEST=Ran on 10.6 and used logs to verify that the resource pak was not being loaded. Did the same on 10.7 and verified that the resource pak was being loaded.


Review URL: http://codereview.chromium.org/6995090

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88426 0039d316-1c4b-4281-b951-d872f2087c98

ui/base/resource/resource_bundle_mac.mm

@@ -11,6 +11,7 @@
 #include "base/mac/mac_util.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/synchronization/lock.h"
+#include "base/sys_info.h"
 #include "base/sys_string_conversions.h"
 #include "ui/gfx/image.h"
 
@@ -47,7 +48,16 @@ FilePath ResourceBundle::GetResourcesFilePath() {
 
 // static
 FilePath ResourceBundle::GetLargeIconResourcesFilePath() {
-  return GetResourcesPakFilePath(@"theme_resources_large", nil);
+  int32 major = 0;
+  int32 minor = 0;
+  int32 bugfix = 0;
+  base::SysInfo::OperatingSystemVersionNumbers(&major, &minor, &bugfix);
+
+  // Only load the large resource pak on if we're running on 10.7 or above.
+  if (major > 10 || (major == 10 && minor >= 7))
+    return GetResourcesPakFilePath(@"theme_resources_large", nil);
+  else
+    return FilePath();
 }
 
 // static