[DevTools] filter any messages from previous session in DevToolsAgentHostImpl

chrome/browser/devtools/devtools_window.cc

Index: chrome/browser/devtools/devtools_window.cc
diff --git a/chrome/browser/devtools/devtools_window.cc b/chrome/browser/devtools/devtools_window.cc
index 41863af5b69883153a826134e32132da0dd64d0c..5344e244fdbb73a9f0699e85a6ca4671e0bc1b46 100644
--- a/chrome/browser/devtools/devtools_window.cc
+++ b/chrome/browser/devtools/devtools_window.cc
@@ -520,7 +520,6 @@ void DevToolsWindow::InspectElement(
     int y) {
   scoped_refptr<DevToolsAgentHost> agent(
       DevToolsAgentHost::GetOrCreateFor(inspected_frame_host));
-  agent->InspectElement(x, y);
   bool should_measure_time = FindDevToolsWindow(agent.get()) == NULL;
   base::TimeTicks start_time = base::TimeTicks::Now();
   // TODO(loislo): we should initiate DevTools window opening from within
@@ -532,6 +531,8 @@ void DevToolsWindow::InspectElement(
                        agent);
   }
 
+  agent->InspectElement(x, y);

[pfeldman, 2015/11/13 17:38:12]

Lets land this separately.

+
   DevToolsWindow* window = FindDevToolsWindow(agent.get());
   if (should_measure_time && window)
     window->inspect_element_start_time_ = start_time;