Adds macros to annotate variables and functions used from same thread or queue.

webrtc/base/thread_annotations.h

Index: webrtc/base/thread_annotations.h
diff --git a/webrtc/base/thread_annotations.h b/webrtc/base/thread_annotations.h
index 612242d611fc627ff7a9067a1a661d02bcbabb81..d49feb7da630a325c67aea86fbf8adfb5d05e298 100644
--- a/webrtc/base/thread_annotations.h
+++ b/webrtc/base/thread_annotations.h
@@ -32,6 +32,9 @@
 // is primarily used when the client cannot express the name of the lock.
 #define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
 #define GUARDED_VAR THREAD_ANNOTATION_ATTRIBUTE__(guarded)
+// Document if a variable/field is not shared and should be accessed from
+// same thread/task queue.
+#define ACCESS_ON(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
 
 // Document if the memory location pointed to by a pointer should be guarded
 // by a lock when dereferencing the pointer. Similar to GUARDED_VAR,
@@ -58,6 +61,8 @@
 // Document if a function expects certain locks to be held before it is called
 #define EXCLUSIVE_LOCKS_REQUIRED(...) \
   THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
+// Document if a function expected to be called from same thread/task queue.
+#define RUN_ON(x) THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(x))
 
 #define SHARED_LOCKS_REQUIRED(...) \
   THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))