Work around iossim compile issues on latest Xcode beta.

testing/iossim/iossim.mm

Index: testing/iossim/iossim.mm
diff --git a/testing/iossim/iossim.mm b/testing/iossim/iossim.mm
index b0d691632c806ad34a23ca901506e0855a48db55..9f67db899b1a5617246cbe0c6fa6ee285170b6f1 100644
--- a/testing/iossim/iossim.mm
+++ b/testing/iossim/iossim.mm
@@ -21,6 +21,26 @@
 // However, there are some forward declarations required to get things to
 // compile.
 
+// TODO(crbug.com/619982): The latest Xcode beta does not include the proper
+// headers to use or compile iossim.  Define them here so iossim can compile for
+// now. Unwind this #ifdef if future betas work, or replace and remove iossim.
+#if defined(__MAC_10_12) && __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_12

[rohitrao (ping after 24h), 2016/06/16 14:50:17]

I would split this block into two, putting one at old line 34, just before
#import "CoreSimulator.h", and the other at old line 59, just before #import
"DVTiPhoneSimulatorRemoteClient.h".

[justincohen, 2016/06/16 15:07:07]

Done.

+@class NSPasteboardItem;

[rohitrao (ping after 24h), 2016/06/16 14:50:17]

You should at least be able to get NSPasteboardItem with:
#import <AppKit/AppKit.h>

[justincohen, 2016/06/16 15:07:07]

Done.

+@class SimDevice;
+@class SimDeviceNotificationManager;
+@class SimDevicePasteboardConnection;
+@class SimMachPortServer;
+@class SimPasteboardItem;
+@class SimRuntime;
+@interface DTiPhoneSimulatorSystemRoot : NSObject<NSCopying> {
+  SimRuntime* _runtime;
+}
++ (id)rootWithSDKVersion:(id)arg1;
+@property(readonly) SimRuntime* runtime;
+@property(readonly, copy) NSString* sdkVersion;
+@end
+#endif
+
 @class DVTStackBacktrace;
 #import "DVTFoundation.h"