[mojo-edk] Add MojoWatch and MojoCancelWatch APIs

mojo/edk/system/platform_handle_dispatcher.cc

Index: mojo/edk/system/platform_handle_dispatcher.cc
diff --git a/mojo/edk/system/platform_handle_dispatcher.cc b/mojo/edk/system/platform_handle_dispatcher.cc
index 3e708c25174f322b52606f3d6c3def1ad465dc8f..2afa8dcba8216265f4ba9f357b1d5f64cff2f901 100644
--- a/mojo/edk/system/platform_handle_dispatcher.cc
+++ b/mojo/edk/system/platform_handle_dispatcher.cc
@@ -24,7 +24,7 @@ Dispatcher::Type PlatformHandleDispatcher::GetType() const {
   return Type::PLATFORM_HANDLE;
 }
 
-MojoResult PlatformHandleDispatcher::Close() {
+MojoResult PlatformHandleDispatcher::Close(RequestContext* request_context) {
   base::AutoLock lock(lock_);
   if (is_closed_ || in_transit_)
     return MOJO_RESULT_INVALID_ARGUMENT;
@@ -51,7 +51,7 @@ bool PlatformHandleDispatcher::EndSerialize(void* destination,
   return true;
 }
 
-bool PlatformHandleDispatcher::BeginTransit() {
+bool PlatformHandleDispatcher::BeginTransit(RequestContext* request_context) {
   base::AutoLock lock(lock_);
   if (in_transit_)
     return false;
@@ -59,7 +59,8 @@ bool PlatformHandleDispatcher::BeginTransit() {
   return in_transit_;
 }
 
-void PlatformHandleDispatcher::CompleteTransitAndClose() {
+void PlatformHandleDispatcher::CompleteTransitAndClose(
+    RequestContext* request_context) {
   base::AutoLock lock(lock_);
 
   in_transit_ = false;
@@ -69,7 +70,7 @@ void PlatformHandleDispatcher::CompleteTransitAndClose() {
   ignore_result(platform_handle_.release());
 }
 
-void PlatformHandleDispatcher::CancelTransit() {
+void PlatformHandleDispatcher::CancelTransit(RequestContext* request_context) {
   base::AutoLock lock(lock_);
   in_transit_ = false;
 }