Add step OverAwait to service protocol

runtime/vm/service/service.md

Index: runtime/vm/service/service.md
diff --git a/runtime/vm/service/service.md b/runtime/vm/service/service.md
index 0ab4ee2f7aaa5f77ba1cc8f5aaba3c8a5108001e..8e8898e3aea4e12f5277fa75b8a23ddb4ebd2728 100644
--- a/runtime/vm/service/service.md
+++ b/runtime/vm/service/service.md
@@ -919,6 +919,10 @@ class Breakpoint extends Object {
   // Has this breakpoint been assigned to a specific program location?
   bool resolved;
 
+  // Is this a synthetic breakpoint that was added as part of a step OverAwait
+  // resume command?
+  bool isSyntheticAsyncBreakpoint [optional].
+
   // SourceLocation when breakpoint is resolved, UnresolvedSourceLocation
   // when a breakpoint is not resolved.
   SourceLocation|UnresolvedSourceLocation location;
@@ -1208,6 +1212,13 @@ class Event extends Response {
   //
   // This is provided for the Extension event.
   ExtensionData extensionData [optional];
+
+  // Is the isolate paused at an await statement?

[rmacnak, 2016/02/17 18:52:00]

await, yield, yield*

[Cutch, 2016/02/17 18:59:03]

Done.

+  //
+  // This is provided for the event kinds:
+  //   PauseBreakpoint
+  //   PauseInterrupted
+  bool atAwait [optional]
 }
 ```
 
@@ -2333,6 +2344,7 @@ is thrown.
 enum StepOption {
   Into,
   Over,
+  OverAwait,
   Out
 }
 ```