Move NSImage-to-CGImageRef conversion code into a common helper function in base/mac_util.h.

base/mac_util.h

Index: base/mac_util.h
diff --git a/base/mac_util.h b/base/mac_util.h
index 4be3c895b996fdeee7168e6e01a596ce754dba0b..d50e9e3cf9aa924fccad2ffb3d3acda6f5f65dee 100644
--- a/base/mac_util.h
+++ b/base/mac_util.h
@@ -17,6 +17,7 @@ class FilePath;
 @class NSWindow;
 #else
 class NSBundle;
+class NSImage;
 class NSWindow;
 #endif
 
@@ -141,6 +142,13 @@ CFTypeRef GetValueFromDictionary(CFDictionaryRef dict,
 // Sets the process name as displayed in Activity Monitor to process_name.
 void SetProcessName(CFStringRef process_name);
 
+// Converts a NSImage to a CGImageRef.  Normally, the system frameworks can do
+// this fine, especially on 10.6.  On 10.5, however, CGImage cannot handle
+// converting a PDF-backed NSImage into a CGImageRef.  This function will
+// rasterize the PDF into a bitmap CGImage.  The caller is responsible for
+// releasing the return value.
+CGImageRef CopyNSImageToCGImage(NSImage* image);
+
 }  // namespace mac_util
 
 #endif  // BASE_MAC_UTIL_H_