[Compiler] Track Ignition background compilation separately in RuntimeStats.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index 03c6f8199fe105e0cec8480db71f79fd6cf4143a..fb0dbd73d18b623ea2250cc8f1095201a3d6880d 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -162,7 +162,8 @@ class CompilationJob {
       : info_(info),
         compiler_name_(compiler_name),
         state_(initial_state),
-        stack_limit_(isolate->stack_guard()->real_climit()) {}
+        stack_limit_(isolate->stack_guard()->real_climit()),
+        executed_on_background_thread_(false) {}
   virtual ~CompilationJob() {}
 
   // Prepare the compile job. Must be called on the main thread.
@@ -191,6 +192,11 @@ class CompilationJob {
   void set_stack_limit(uintptr_t stack_limit) { stack_limit_ = stack_limit; }
   uintptr_t stack_limit() const { return stack_limit_; }
 
+  bool executed_on_background_thread() const {
+    DCHECK(can_execute_on_background_thread() ||
+           !executed_on_background_thread_);

[Camillo Bruni, 2016/12/16 09:25:05]

DCHECK_IMPLIES(!can_execute_on_background_thread(),
!executed_on_background_thread_)

[rmcilroy, 2016/12/16 23:48:05]

Done.

+    return executed_on_background_thread_;
+  }
   State state() const { return state_; }
   CompilationInfo* info() const { return info_; }
   Isolate* isolate() const;
@@ -213,6 +219,7 @@ class CompilationJob {
   const char* compiler_name_;
   State state_;
   uintptr_t stack_limit_;
+  bool executed_on_background_thread_;
 
   MUST_USE_RESULT Status UpdateState(Status status, State next_state) {
     if (status == SUCCEEDED) {