[Mac] Add a new WebSandboxSupport method to get the display's color space.

Source/platform/image-decoders/ImageDecoder.h

Index: Source/platform/image-decoders/ImageDecoder.h
diff --git a/Source/platform/image-decoders/ImageDecoder.h b/Source/platform/image-decoders/ImageDecoder.h
index 2a305c40b8887d342726adac3a3ba8d2fe3e0420..50028ffbd0eaec578e5a77ffaa2c689b24a5a39b 100644
--- a/Source/platform/image-decoders/ImageDecoder.h
+++ b/Source/platform/image-decoders/ImageDecoder.h
@@ -42,8 +42,8 @@
 #if USE(QCMSLIB)
 #include "qcms.h"
 #if OS(MACOSX)
+#include "public/platform/mac/WebSandboxSupport.h"
 #include <ApplicationServices/ApplicationServices.h>
-#include "wtf/RetainPtr.h"
 #endif
 #endif
 
@@ -200,8 +200,8 @@ public:
         {
             // FIXME: Add optional ICCv4 support.
 #if OS(MACOSX)
-            RetainPtr<CGColorSpaceRef> monitorColorSpace(AdoptCF, CGDisplayCopyColorSpace(CGMainDisplayID()));
-            CFDataRef iccProfile(CGColorSpaceCopyICCProfile(monitorColorSpace.get()));
+            CGColorSpaceRef monitorColorSpace = Platform::current()->sandboxSupport()->displayColorSpace();

[Noel Gordon, 2014/09/10 08:46:27]

As asked on the other review, is this thread-safe?  This code could be called
from the blink main-thread, or on any impl-side-painting thread.  Maybe that's
why the unit tests are complaining ...

+            CFDataRef iccProfile(CGColorSpaceCopyICCProfile(monitorColorSpace));
             if (iccProfile) {
                 size_t length = CFDataGetLength(iccProfile);
                 const unsigned char* systemProfile = CFDataGetBytePtr(iccProfile);