Per-closure breakpoints; restructure breakpoint implementation to keep a list of conditions.

runtime/vm/json_stream.cc

Index: runtime/vm/json_stream.cc
diff --git a/runtime/vm/json_stream.cc b/runtime/vm/json_stream.cc
index 2ed62efd8c1caf16ed1ab3bfaa4e79f129dc22e6..60e986ee3539ddd17f586a059fc551208a927af8 100644
--- a/runtime/vm/json_stream.cc
+++ b/runtime/vm/json_stream.cc
@@ -327,7 +327,7 @@ void JSONStream::PrintValue(const Object& o, bool ref) {
 }
 
 
-void JSONStream::PrintValue(SourceBreakpoint* bpt) {
+void JSONStream::PrintValue(BreakpointCondition* bpt) {
   PrintCommaIfNeeded();
   bpt->PrintJSON(this);
 }
@@ -415,7 +415,7 @@ void JSONStream::PrintProperty(const char* name, const ServiceEvent* event) {
 }
 
 
-void JSONStream::PrintProperty(const char* name, SourceBreakpoint* bpt) {
+void JSONStream::PrintProperty(const char* name, BreakpointCondition* bpt) {
   PrintPropertyName(name);
   PrintValue(bpt);
 }