Bug 1600605, add support for mediumhigh priority ipdl messages, r=jld

Differential Revision: https://phabricator.services.mozilla.com/D57013

--HG--
extra : moz-landing-system : lando

ipc/chromium/src/chrome/common/ipc_message.h

@@ -65,6 +65,7 @@ class Message : public Pickle {
     NORMAL_PRIORITY = 0,
     INPUT_PRIORITY = 1,
     HIGH_PRIORITY = 2,
+    MEDIUMHIGH_PRIORITY = 3,
   };
 
   enum MessageCompression {

ipc/glue/MessageChannel.cpp

@@ -2072,6 +2072,9 @@ MessageChannel::MessageTask::GetPriority(uint32_t* aPriority) {
     case Message::HIGH_PRIORITY:
       *aPriority = PRIORITY_HIGH;
       break;
+    case Message::MEDIUMHIGH_PRIORITY:
+      *aPriority = PRIORITY_MEDIUMHIGH;
+      break;
     default:
       MOZ_ASSERT(false);
       break;

ipc/ipdl/ipdl/ast.py

@@ -9,7 +9,7 @@ INSIDE_CPOW_NESTED = 3
 NORMAL_PRIORITY = 1
 INPUT_PRIORITY = 2
 HIGH_PRIORITY = 3
-
+MEDIUMHIGH_PRIORITY = 4
 
 class Visitor:
     def defaultVisit(self, node):

ipc/ipdl/ipdl/lower.py

@@ -1799,8 +1799,10 @@ def _generateMessageConstructor(md, segmentSize, protocol, forReply=False):
         prioEnum = 'NORMAL_PRIORITY'
     elif prio == ipdl.ast.INPUT_PRIORITY:
         prioEnum = 'INPUT_PRIORITY'
-    else:
+    elif prio == ipdl.ast.HIGH_PRIORITY:
         prioEnum = 'HIGH_PRIORITY'
+    else:
+        prioEnum = 'MEDIUMHIGH_PRIORITY'
 
     if md.decl.type.isSync():
         syncEnum = 'SYNC'

ipc/ipdl/ipdl/parser.py

@@ -563,9 +563,10 @@ def p_Priority(p):
     """Priority : ID"""
     kinds = {'normal': 1,
              'input': 2,
-             'high': 3}
+             'high': 3,
+             'mediumhigh': 4}
     if p[1] not in kinds:
-        _error(locFromTok(p, 1), "Expected normal or high for prio()")
+        _error(locFromTok(p, 1), "Expected normal, input, high or mediumhigh for prio()")
 
     p[0] = {'prio': kinds[p[1]]}
 

ipc/ipdl/sync-messages.ini

@@ -141,6 +141,8 @@ description =
 description =
 [PTestPriority::PMsg4]
 description =
+[PTestPriority::PMsg6]
+description =
 [PTestRPC::Test1_Start]
 description =
 [PTestRPC::Test1_InnerEvent]

ipc/ipdl/test/cxx/PTestPriority.ipdl

@@ -7,10 +7,13 @@ parent:
     prio(input) sync PMsg2();
     prio(high) async PMsg3();
     prio(high) sync PMsg4();
+    prio(mediumhigh) async PMsg5();
+    prio(mediumhigh) sync PMsg6();
 
 child:
     prio(input) async CMsg1();
     prio(high) async CMsg2();
+    prio(mediumhigh) async CMsg3();
 };
 
 } // namespace _ipdltest

ipc/ipdl/test/ipdl/ok/Prio.ipdl

@@ -4,4 +4,5 @@ child:
   prio(normal) async NormalPrio();
   prio(high) async HighPrio();
   prio(input) async InputPrio();
+  prio(mediumhigh) async MediumHighPrio();
 };