EDK: Change Awakable::Awake()'s context, etc., to be a uint64_t.

mojo/edk/system/dispatcher.cc

Index: mojo/edk/system/dispatcher.cc
diff --git a/mojo/edk/system/dispatcher.cc b/mojo/edk/system/dispatcher.cc
index 7c4d92937794629d1e0970d8e3a1ccf9daa7542c..28e7f9cc39a6149e619bd931f2a63dc481d92e36 100644
--- a/mojo/edk/system/dispatcher.cc
+++ b/mojo/edk/system/dispatcher.cc
@@ -282,7 +282,7 @@ HandleSignalsState Dispatcher::GetHandleSignalsState() const {
 
 MojoResult Dispatcher::AddAwakable(Awakable* awakable,
                                    MojoHandleSignals signals,
-                                   uint32_t context,
+                                   uint64_t context,
                                    HandleSignalsState* signals_state) {
   MutexLocker locker(&mutex_);
   if (is_closed_) {
@@ -483,7 +483,7 @@ HandleSignalsState Dispatcher::GetHandleSignalsStateImplNoLock() const {
 MojoResult Dispatcher::AddAwakableImplNoLock(
     Awakable* /*awakable*/,
     MojoHandleSignals /*signals*/,
-    uint32_t /*context*/,
+    uint64_t /*context*/,
     HandleSignalsState* signals_state) {
   mutex_.AssertHeld();
   DCHECK(!is_closed_);