Plumbing devtools agent host id and request id between processes

third_party/WebKit/Source/core/inspector/IdentifiersFactory.cpp

Index: third_party/WebKit/Source/core/inspector/IdentifiersFactory.cpp
diff --git a/third_party/WebKit/Source/core/inspector/IdentifiersFactory.cpp b/third_party/WebKit/Source/core/inspector/IdentifiersFactory.cpp
index 0b8db126ef5d80eaf6ed2fcee54694e550f7253b..e663ccbad44766cb8599c44b0f6eaf18487eefed 100644
--- a/third_party/WebKit/Source/core/inspector/IdentifiersFactory.cpp
+++ b/third_party/WebKit/Source/core/inspector/IdentifiersFactory.cpp
@@ -49,6 +49,16 @@ String IdentifiersFactory::CreateIdentifier() {
 
 // static
 String IdentifiersFactory::RequestId(unsigned long identifier) {
+  // Odd request Ids are set by the browser.  For those we use a PID of 0
+  // because for browser side navigations the PID may not be known when an event
+  // is sent because the renderer hasn't been created yet.
+  int signed_identifier = static_cast<int>(identifier);
+  if (signed_identifier < 0) {
+    StringBuilder builder;
+    builder.Append("0.");
+    builder.AppendNumber(signed_identifier);
+    return builder.ToString();
+  }
   return identifier ? AddProcessIdPrefixTo(identifier) : String();
 }