DevTools: make pause work for script evaluations

webkit/glue/devtools/debugger_agent_manager.cc

Index: webkit/glue/devtools/debugger_agent_manager.cc
===================================================================
--- webkit/glue/devtools/debugger_agent_manager.cc	(revision 21636)
+++ webkit/glue/devtools/debugger_agent_manager.cc	(working copy)
@@ -29,6 +29,12 @@
 // static
 DebuggerAgentManager::DeferrersMap DebuggerAgentManager::page_deferrers_;
 
+// static
+bool DebuggerAgentManager::in_utility_context_ = false;
+
+// static
+bool DebuggerAgentManager::debug_break_delayed_ = false;
+
 namespace {
 
 class CallerIdWrapper : public v8::Debug::ClientData {
@@ -157,7 +163,11 @@
 #if USE(V8)
   DCHECK(DebuggerAgentForHostId(debugger_agent->webdevtools_agent()->host_id())
              == debugger_agent);
-  v8::Debug::DebugBreak();
+  if (in_utility_context_) {
+    debug_break_delayed_ = true;
+  } else {
+    v8::Debug::DebugBreak();
+  }
 #endif
 }
 
@@ -201,15 +211,25 @@
     return;
   }
 
-  // If the context is from one of the inpected tabs or injected extension
-  // scripts it must have host_id in the data field.
-  int host_id = WebCore::V8Proxy::contextDebugId(context);
-  if (host_id != -1) {
-    DebuggerAgentImpl* agent = DebuggerAgentForHostId(host_id);
-    if (agent) {
-      agent->DebuggerOutput(out);
-      return;
+  if (in_utility_context_) {
+    if (message.GetEvent() == v8::Break) {
+      // This may happen when two tabs are being debugged in the same process.
+      // Suppose that first debugger is pauesed on an exception. It will run
+      // nested MessageLoop which may process Break request from the second
+      // debugger.
+      debug_break_delayed_ = true;
     }
+  } else {
+    // If the context is from one of the inpected tabs or injected extension
+    // scripts it must have host_id in the data field.
+    int host_id = WebCore::V8Proxy::contextDebugId(context);
+    if (host_id != -1) {
+      DebuggerAgentImpl* agent = DebuggerAgentForHostId(host_id);
+      if (agent) {
+        agent->DebuggerOutput(out);
+        return;
+      }
+    }
   }
 
   if (!message.WillStartRunning()) {