Add crash keys about field trial shared memory errors.

base/memory/shared_memory_helper.h

Index: base/memory/shared_memory_helper.h
diff --git a/base/memory/shared_memory_helper.h b/base/memory/shared_memory_helper.h
index b515828c08c4952bdfba476b65ebca878f1fe487..5c8b86e618de1149d089beb225db9c7adcc634d1 100644
--- a/base/memory/shared_memory_helper.h
+++ b/base/memory/shared_memory_helper.h
@@ -16,16 +16,21 @@ namespace base {
 // with the fdopened FILE. |readonly_fd| is populated with the opened fd if
 // options.share_read_only is true. |path| is populated with the location of
 // the file before it was unlinked.
-// Returns false if there's an unhandled failure.
+// Returns false if there's a failure and sets |error|.
 bool CreateAnonymousSharedMemory(const SharedMemoryCreateOptions& options,
                                  ScopedFILE* fp,
                                  ScopedFD* readonly_fd,
-                                 FilePath* path);
+                                 FilePath* path,
+                                 SharedMemoryError* error);
 
 // Takes the outputs of CreateAnonymousSharedMemory and maps them properly to
 // |mapped_file| or |readonly_mapped_file|, depending on which one is populated.
-bool PrepareMapFile(ScopedFILE fp, ScopedFD readonly_fd, int* mapped_file,
-                    int* readonly_mapped_file);
+// Returns false if there's a failure and sets |error|.
+bool PrepareMapFile(ScopedFILE fp,
+                    ScopedFD readonly_fd,
+                    int* mapped_file,
+                    int* readonly_mapped_file,
+                    SharedMemoryError* error);
 #endif
 
 }  // namespace base