DevTools: expose session to handlers.

content/browser/devtools/protocol/devtools_domain_handler.cc

Index: content/browser/devtools/protocol/devtools_domain_handler.cc
diff --git a/content/browser/devtools/protocol/devtools_domain_handler.cc b/content/browser/devtools/protocol/devtools_domain_handler.cc
index d1521bef6d24ae8b0c345207545aab3051957833..8e17bc1ff8a69b450301b88e66356476df3852ec 100644
--- a/content/browser/devtools/protocol/devtools_domain_handler.cc
+++ b/content/browser/devtools/protocol/devtools_domain_handler.cc
@@ -4,11 +4,18 @@
 
 #include "content/browser/devtools/protocol/devtools_domain_handler.h"
 
+#include "content/browser/devtools/devtools_agent_host_impl.h"
 #include "content/browser/devtools/protocol/protocol.h"
 
 namespace content {
 namespace protocol {
 
+// static
+DevToolsSession* DevToolsDomainHandler::GetFirstSession(
+    DevToolsAgentHostImpl* host) {
+  return host->session();
+}
+
 DevToolsDomainHandler::DevToolsDomainHandler(const std::string& name)
     : name_(name) {
 }